In 1990, Julia Roberts wore a now-iconic outfit of black leather boots, blonde wig, and white tank top connected by a gold ring to a blue mini-skirt as "Pretty Woman's" hooker-with-a-heart-of-gold Vivian Ward.

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Emma Roberts dressed as her aunt Julia Roberts' character from "Pretty Woman."

This Halloween, her niece Emma Roberts -- who wasn't even born until the year after the film came out  -- donned a replica of the same outfit to attend a Halloween party with boyfriend Evan Peters ("American Horror Story"). (No, Peters didn't dress as Richard Gere's character from the same film.)

The costume has sparked controversy before. Child beauty pageant contestant Paisley, age 3, was dressed up in the same outfit, only a million sizes smaller, on a 2011 episode of "Toddlers & Tiaras" on TLC.

At the time, another pageant mom was horrified, saying ""I would never ever do that to my little girl. Ever ... It's outfits like that that give us a bad rap."

At 21, Roberts is hardly a toddler, and she's apparently not the only woman who wants to dress like a prostitute on Halloween. In fact, you can buy similar costumes online.

Still, not everyone loved the getup. Wrote Alexis Rhiannon on Crushable.com, "(Julia Roberts) also played many other roles! Very few of them actual hookers! You could’ve been Tinker Bell from 'Hook,' or Erin Brockovich, or even a Mystic Pizza! The boys would’ve loved that!"

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• 'Toddler' dresses like 'Pretty Woman' hooker
• Did Richard Gere really slam'Pretty Woman'?