People.com Halloween Party

Silly, Sexy, Cool : Star Halloween Costumes!

From Mariah's naughty firefighter to Kim's Wonder Woman, see how celebs reveal their alter egos

PARIS HILTON

A sense of humor? That's hot! The heiress – then newly out of jail – pokes fun of herself in her sexy jailbird costume while partying in 2007 at LAX nightclub in Las Vegas.