Christina Ricci: Ricci and boyfriend Curtis Buchanan are pretty adorable as beer-drinking mimes.
Christina Aguilera: X-tina and her mini-me dressed up as skeletons.
James Gandolfini: The former Sopranos star kept it simple, yet hilarious, as Homer Simpson.
Gwen Stefani & Gavin Rossdale: The couple took their dino-clad kids out on the town, despite Rossdale having forgotten his costume.
Mariah Carey & Nick Cannon: Nick dressed like an angel, while Mariah took a night off from her usual slutty tween costumes to wear her bridal undergarments.
Heidi Klum: Halloween-lover Heidi does it up as a crow.
Michelle Obama: The lovely first lady plays it catty at the White House Halloween celebration.
Robert Gibbs: Press Secretary Gibbs channels Cheney for his Darth Vader costume.