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

MARIAH CAREY & NICK CANNON

The husband and wife went coordinated in 2008, first as a carton of milk and some (very sexy) cookies, and then as a fireman and (what else?) his very sexy mate at a Halloween bash they hosted at N.Y.C. hot spot Marquee.