Politics and Hollywood mingle on a cordial basis most days of the year. But on the night of the White House Correspondents' Association Dinner, the gloves come off. On Saturday night, both President Barack Obama and comedian Conan O'Brien took to the dais at the "nerd prom" -- and each took a very different approach to making the room laugh ... and blush.

Here are some of the most memorable moments:

Winning!
President Obama kicked things off in high style by heading up to the microphone to the strains of DJ Khaled's rap song"All I Do Is Win." "How do you like my new entrance music?" he asked the crowd, putting on a little 'tude. "Rush Limbaugh warned you about this. Second term, baby."

'Obama,' the movie
President Obama played up his Hollywood connections with the help of Steven Spielberg. The President told the crowd that the "Lincoln" director's next project would be another presidential biopic: "Obama." "Why wait?" said the director (who was also in the audience) in a taped video piece about his follow-up to the Oscar-winning "Lincoln." And since "Lincoln's" star Daniel Day-Lewis went over so well, he was going to cast Lewis in the key role. Cut to President Obama pretending to be Daniel Day-Lewis pretending to be President Obama. "The hardest part? Trying to understand his motivations," said Obama-as-Lewis-as-Obama. Another interesting "casting" choice: "30 Rock's" Tracy Morgan as Vice President Joe Biden. We'd watch that.

That's entertainment
The president showed he clearly has his finger on the pulse of all kinds of entertainment, referring to Jimmy Fallon's upcoming "Tonight Show" ascension and the recent kerfuffle over Beyonce and Jay-Z's trip to Cuba ("I've got 99 problems and now Jay-Z's one"). He also noted that no one from The History Channel was in attendance: "I guess they were embarrassed by the whole 'Obama is a devil' thing," he said, referring to the appearance of Satan in History's "The Bible" miniseries, and how the actor who played him seemed to resemble the president. 

Zing!
Conan O'Brien used his 15 minutes to zap his way through as many topics as possible, with as many one- or two-line zingers as he could manage:

• "Since (Obama's) being elected, the number of Popes has doubled, and the number of 'Tonight Show' hosts has tripled!"
• After noting that members of the cast of "Duck Dynasty" were in the audience: "That means the guys from 'Storage Wars' said 'no.'"
• And he wrapped up by proposing another made-for-TV movie -- this time a miniseries -- starring many um, familiar faces playing the president's team and colleagues. Suggestions? Vice President Joe Biden played by Bob Barker, Rep. Paul Ryan played by Mr. Bean (a character created by Rowan Atkinson) and Sen. Harry Reid "played by the old man from the 'American Gothic' painting.'" We still think Morgan's the better choice for Biden, though.

Kudos for Beantown
Casting the inevitable Obama administration movie aside, the one area the two speakers did overlap on and grow serious about was the way in which the citizens of Boston have shown their strength in adversity following the Boston Marathon bombings on April 15. Boston native O'Brien noted he had relatives in nearby Watertown, and he thanked the president for his support of the city. "It's been said recently that you don't mess with Boston," said O'Brien. "As someone who grew up there, I'd like to echo that sentiment. It's really pretty simple: If you're going to pick on a city, don't choose one where nine out of every 10 people are related to a cop."

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Conan O'Brien won't be performing at the White House Correspondents' Association Dinner until Saturday night, but he's already in the nation's capital, goofing around -- as shown in this photo he tweeted Friday.

"Practicing my opening 'Goofy Sunglasses' bit," he noted in the pic's caption.

This will be Conan's second time on the Dinner dais, having performed there originally in 1995, when President Clinton was in office. He told Politico that having the leader of the free world at his elbow was actually helpful: "Clinton was really laughing and he gets really red in the face when he laughs, and at one point he was hitting the table and I thought, 'This is great!' ... I definitely wouldn’t want to do my show every night with the president of the United States sitting next to me, chewing Nicorette. But it certainly amps things up."

The White House Correspondents' Dinner will be shown on several networks on Saturday night and O'Brien is expected to appear at 10 p.m. ET. Check back on TODAY.com for a roundup of the funniest moments!

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Two veeps were in the White House Friday: Vice President Joe Biden lunched with "Veep" star Julia Louis-Dreyfus.

Lawrence Jackson / WhiteHouse.gov

Julia Louis-Dreyfus isn't a vice-president, but she plays one on TV's "Veep." The actress met with real Vice President Joe Biden on Friday at the White House.

Like many vice presidents before him, President Obama's No. 2 has given the HBO political comedy plenty of material to parody. But Biden's blunders pale in comparison to the humiliating setbacks suffered by Selina Meyer, Louis-Dreyfus' character, ever since a failed presidential bid landed her in the vice president's office.

Her lunch date at Biden's real-life workplace wasn't the first time the actress has spoken with the vice president.

"(He) was in touch with me to congratulate me on winning the Emmy for this part, and he was very funny about it," Louis-Dreyfus told Politico, "which led me to believe that he may have seen a couple of episodes."

The real politician must have a sense of humor, because one of those episodes, "Frozen Yoghurt," spoofs Biden's gaffe at a custard shop: In 2010, he made headlines for snapping at the store's manager, who complained about his taxes.

Season two of "Veep" premieres Sunday on HBO. Meanwhile, check out Louis-Dreyfus' behind-the-scenes WhoSay video and photo gallery.

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Rapper Jay-Z is using his art to respond to criticism about his and wife Beyonce's recent trip to Cuba on their fifth anniversary. The tune released Thursday, "Open Letter," includes lines such as "I done turned Havana to Atlanta" and "I'm in Cuba, I love Cubans. This Communist talk is so confusing when it's from China, the very mic that I'm using."

The song also includes lines that imply the White House had a hand in giving him and his wife the clearance to travel to Havana. For example: "Boy from the hood, but got White House clearance" and "Obama said, 'Chill, you gonna get me impeached.' "

During Thursday's White House briefing, Press Secretary Jay Carney denied the song's suggestion that there was any White House involvement in Jay-Z and Beyonce's trip.

"I guess nothing rhymes with Treasury, because Treasury offers and gives licenses for travel, as you know, and the White House has nothing to do with it," he said in response to a reporter's question. "The White House, from the president on down, had nothing to do with anybody's personal -- anybody's travel to Cuba. ... The president did not communicate with Jay-Z over this trip."

"Open Letter" is available online at LifeAndTimes.com. (Warning: The song is not for those with ears sensitive to curse words.)

On Tuesday, the Department of the Treasury confirmed that the superstar couple's trip to Cuba was sanctioned. "It is our understanding that the travelers in question traveled to Cuba pursuant to an educational exchange trip," the Treasury's assistant secretary for legislative affairs wrote.

While in Havana, the famous pair dined at La Guarida, walked through colonial Old Havana and took photos with schoolchildren. 

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Want to find Bill Clinton on Twitter? Well, as of Monday night you just have to type in @PrezBillyJeff, which is a dignified handle any former leader of the free world would be happy to own. And who can you blame -- er, credit -- for it? Stephen Colbert.

It was all part of Monday night's "Colbert Report," which was devoted entirely to Colbert's interview of former President Clinton, which had been pre-taped at Clinton's annual Global Initiative University (CGIU) meeting this past weekend. They tackled several serious subjects, including time management and American foreign assistance, but after a while Colbert discovered that while the former president may use Facebook, he does not use Twitter.

"I think I'm so, sort of insecure," he said. "What if you tweet and nobody tweets back?"

Colbert decided it was time to rectify this situation. Holding an iPhone, Colbert announced that he'd "taken the liberty" of opening a Twitter account for President Clinton, but the first obvious handles -- @PresidentClinton, @WilliamJeffersonClinton -- were taken. But @PrezBillyJeff "was available."

Chuckling, Clinton let Colbert send out his first tweet: "Just spent amazing time with Colbert. Is he sane? He is cool!" Colbert added the hashtag of #CGIU, and out it went into the world.

"Sir, welcome to the future," said Colbert, and shook his hand.

Alas, Clinton has not tweeted again as of this writing. It's not a "verified" account yet, and the description reads: "I am President William Jefferson BIlly Jeff Rodham Clinton. Stephen Colbert is my BFF." But he already has 39,666 followers -- and he's following one person.

Who would that be? @StephenAtHome, of course.

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Jason Kempin / Getty Images

Comedian Conan O'Brien is set to host the White House Correspondents Dinner.

Team CoCo is headed to Washington. Conan O'Brien has signed on to emcee the annual White House Correspondents Dinner set for April 27 and airing on C-SPAN. 

This will be the second go-round in the gig for the late night host -- he last performed the duties at the 1995 affair featuring then-President Bill Clinton. 

The news was first announced on Twitter by the organization's president, Ed Henry, Fox News' chief White House reporter. 

President Obama and Jimmy Kimmel high-five at the White House Correspondents Dinner 

"@ConanObrien was terrific at '95 correspondents dinner w/Clinton - excited about @TeamCoco return engagement April 27 @andyrichter," Henry tweeted. 

No doubt, Conan will have plenty of material to work with considering who's coming. 

Along with a who's who of journalists and celebrity guests (we're lookin' at you, Kim Kardashian and Donald Trump), President Barack Obama and first lady Michelle Obama, per tradition, will be in attendance as the guests of honor. 

Take a look back at the 2012 White House Correspondents Dinner 

Previous comics who've hosted the event include Jimmy Kimmel, Seth Meyers, Jay Leno and, perhaps most memorably, Stephen Colbert, whose infamous roast of President George W. Bush caused quite the kerfuffle.

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NBC

Mick Jagger and Ed Koch on "Saturday Night Live."

Outside of New York City, Mayor Ed Koch may seem a distant memory -- yet another big New York personality who happened to run the Big Apple from 1978-89. But while few big city mayors resonate much beyond their town's borders or for longer than their terms of office, Koch -- who died on Feb. 1 at 88 -- was a big city mayor like no other. 

Among his many accomplishments politically (including three terms of office and eight years as a congressman), Koch left a very large media footprint during his post-mayoral years. He was the first New York City mayor to ever host "Saturday Night Live" (1983) and ultimately made four appearances on the NBC show: Cameos in 1978 and 1984, and as a co-host in 1984 ("I was pretty good," he said in 2010).

In general, Koch was a busy, camera-loving guy: Based on IMDB.com credits, he appeared in more than 60 films and TV shows (including "Sex and the City," "The Muppets Take Manhattan" and "We Own The Night") often -- but not always -- as himself. 

His longest-running TV gig featured him in his best-known role -- himself -- as he presided over "The People's Court" from 1997-99. And starting in 2009, he hosted a weekly web series, "Mayor at the Movies," in which the film buff opined on everything from "Moneyball" to Betty White's "Saturday Night Live" performance.

Meanwhile, he also found time to write several non-fiction books ("How'm I Doing? The Wit and Wisdom of Ed Koch," "Giuliani: Nasty Man"), crime fiction novels ("Murder at City Hall," "Murder on Broadway") and even a children's book, "Eddie, Harold's Little Brother."

He did always have a sense of show business presence, so while it could never have been planned, it was almost fitting that he made his final exit just days after the documentary "Koch" had its first official New York screening.

Early reviews give thumbs-up to the film: "Compared to the man himself, 'Koch' is low-key," wrote the New York Daily News. "Director Neil) Barsky examines this colorful, often dramatic parade with his veteran reporter's eye. Yet while opposing views are heard, Koch's take on them -- now 25 to 35 years after the fact -- puts a definite period at the end of the sentence." Adds the New York Times, "It is hardly an uncritical account of Mr. Koch's dozen years as mayor, but time has a way of turning the furious political battles of the past into amusing war stories." 

Few would be happier than Ed Koch to know he was still being talked about, 24 years after he left office. Mr. Mayor, you may be gone, but you're still doin' fine.

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A holiday concert attended Sunday by President Barack Obama and his family included some non-traditional entertainment this year: a performance by South Korean rapper and Internet sensation PSY. 

PSY— wearing an all-red outfit including a sparkling, sequined top— was backed by dancers wearing reindeer antlers as he performed his popular "Gangnam Style" dance, which mimics riding a horse.

The rapper, born Park Jae-sang, had apologized Friday for using what he called "inflammatory and inappropriate language" during anti-U.S. protests at concerts in 2002 and 2004. The flak from his remarks didn't dampen the festive holiday mood Sunday.

Other performers at the charity concert included Diana Ross, Demi Lovato, "American Idol" winner Scotty McCreery and Megan Hilty, star of the NBC musical drama "Smash."

In brief remarks, Obama said the celebration was "a chance to get in the Christmas spirit, spread some joy and sing along with artists who have much better voices than we do."

He also said the holiday season was a time to remember that everyone is "incredibly blessed in so many ways," and to share with the less fortunate, such as those in hospitals, shelters and battlefields far from home.

"Those blessings aren't just meant to be enjoyed, they're meant to be used and shared with those who have less," he said.

The "Christmas in Washington" concert benefits Children's National Medical Center. Before the show, Obama was accompanied by his wife, Michelle, and daughters, Sasha and Malia, as he presented a basket of books to four former patients of the center, who were dressed as elves.

The 31st annual concert was held Sunday at the National Building Museum and was hosted for a second year by comedian Conan O'Brien.

It is scheduled to air Dec. 21 on TNT. 

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Conservative media personality Glenn Beck's attempt to sell a project he called "Obama in Pee Pee" was thwarted by eBay Wednesday, but Beck then began taking bids via email instead.

theblazeTV.com

Glenn Beck's Obama bobblehead floating in a jar of what he joked was "pee pee," but was reportedly only beer.

On Tuesday, Beck was discussing a controversial painting titled "The Truth," which shows President Barack Obama in a Christ-like pose wearing a crown of thorns.

Dressed as a parody of an artist, Beck pointed to a copy of the Constitution and said, "That document means I can't stop (the artist), and the spirit of that document is that I shouldn't try."

After painting clothing on replicas of some famous nudes, Beck then walked to a large jar of yellow liquid, calling it "my own specially brewed CountryTime, if you will."

Placing a bobblehead of a flag-draped Obama in the jar, Beck called the president the "savior of mankind" and announced, "this is when icon and art come together." He labeled the jar with a pricetag of $25,000.

"So whether you're offended by this one or by this one," he said, indicating the Obama jar and a framed copy of the painting showing Obama in the crucifixion pose, "Sucks to be you, doesn't it? Welcome to America."

He then said if the original project sold, he would make another one featuring "Michelle Obama and her little abs."

On Wednesday's show, Beck was given a letter from eBay, where bidding on the jar had topped $11,000. The letter said the auction had been removed because it contained "bodily waste." The liquid was revealed on Beck's website to be beer, not urine.

"But everybody on the left, they are so open and tolerant, and they just don't like it when people complain about taking the image of the savior and putting him in pee pee," Beck said. "But the savior Obama in pee pee? Oh no, that's just too much."

Beck said proceeds from the sale of the jar would go to his Mercury One charity.

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Alexander Demianchuk / AP

Madonna in concert in Russia.

Madonna drew boos and triggered a walkout by several concertgoers after she touted President Barack Obama on her "MDNA Tour" in New Orleans.

The Material Girl asked during Saturday night's performance: "Who's registered to vote?" She added: "I don't care who you vote for as long as you vote for Obama."

Drawing boos in touting Obama over Republican Mitt Romney, Madonna followed: "Seriously, I don't care who you vote for ... Do not take this privilege for granted. Go vote."

Madonna is often outspoken. Some Colorado fans, mindful of a mass shooting there, complained she used a fake gun to shoot a masked gunman in a recent concert act in Denver. A Madonna concert in Paris in July drew ire when a video showed a swastika on a politician's forehead.

Slideshow: Madonna

Evan Agostini / AP

Launch slideshow

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