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

2 of 28

LANCE BASS & KIM KARDASHIAN

Look who Wonder Woman has ensnared in her magic lasso! Dressing as the superwoman, Kardashian keeps close to the new grad at L.A.'s Stone Rose, where the reality star cohosted a Halloween masquerade bash with PAMA.
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