People.com's 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

13 of 28

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 last year at LAX nightclub in Las Vegas.
Boo! Hollywood's Real Ghost Hunters!

Boo! Hollywood's Real Ghost Hunters!

Is Leighton a fraidy-cat? Does Anna believe in ghosts? Find out who jumps at things that go bump in the night!

See Photos