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
More from PEOPLE
KATE BECKINSALE
The actress (along with daughter Lily, then 9) has a devil-may-care attitude during a night of trick-or-treating in Brentwood, Calif.
