People.com's Halloween Party

Trick-or-Treat! Hollywood Suits Up for Halloween

See how Jimmy & Mindy, Melissa McCarthy, the Affleck family and more are getting into the spooky spirit of the season

KELLY OSBOURNE

The Halloween 2013 MVP (seriously, how many different costumes did she wear this week?!) presents her grand finale, a bloody princess get-up, at Adam Lambert's Cîroc-sponsored Oct. 31 party at Bootsy Bellows in West Hollywood.