Simplicity is key for Halloween in Hollywood this year, according to celebs like Christie Brinkley and Emmy Rossum.

"I don't ever go too gory," Rossum, 23, tells "But I don't [go the] 'sexy waitress' route, either. I normally find something fun. Maybe Pippi Longstocking."

Former model Brinkley, 55, says some of her best haunted finds have come from her own closet.

"I've got my cowgirl clothes, Morocan-[themed outfits]...I can be Frida Kahlo like that," she says, joking that some of her fashion faux pas "have made the best Halloween costumes."

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While Brinkley finds inspiration in her closet, other stars simply flip on the TV to plan their costume.

This year, Tyra Banks and Spencer and Heidi Pratt channeled reality stars. Banks dressed like Kim Kardashian and on Thursday, the Hills stars outfitted themselves as tormented TLC couple Jon and Kate Gosselin.