Costume Gala Is Right!

The Costume Institute held its annual gala last night at the Metropolitan Museum of Art in New York, and some celebs took the organization's name way too literally. Trick or Treat?!
Kirsten Dunst, Jessica Simpson, Scarlett Johansson
From Kirsten Dunst to Jessica Simpson and Scarlett Johansson, check out the stars who helped celebrate Halloween in May!