1 of 16 Gregg DeGuire/WireImage.com
Seal and Heidi Klum are having too much fun to be sinful as Eve and the Apple.
2 of 16 Denise Truscello/WireImage.com
Christina Aguilera and hubby Jordan Bratman are a little too naughty for Grey's Anatomy!
3 of 16 Dimitrio Kambouris/WireImage.com
American Pie star Jason Biggs goes trick-or-treating with Toto as The Wizard of Oz's Dorothy.
4 of 16 James Devaney/WireImage.com
Matt Lauer channels Captain Jack Sparrow from Pirates of the Caribbean.
5 of 16 John Sciulli/WireImage.com
The Riches' Minnie Driver is all sparkles in her fairy costume.
6 of 16 Jean-Paul Aussenard/WireImage.com
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CSI: Miami's Eva La Rue (with daughter Kaya) is a spooky, illuminating ghost bride on the red carpet.
7 of 16 Kevin Parry/WireImage.com
Carpoolers' Jerry O'Connell goes green with a giant alligator disguise.
8 of 16 John Sciulli/WireImage.com
Desperate Housewives' Kyle MacLachlan would never fit in on Wisteria Lane in that outfit!
9 of 16 John Sciulli/WireImage.com
24 alum Elisha Cuthbert trades red carpet glam for a Clockwork Orange costume.
10 of 16 Mike Guastella/WireImage.com
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Chris Klein and Big Love's Ginnifer Goodwin get in the Halloween spirit as a slice of pizza and a witch.
11 of 16 Gregg DeGuire/WireImage.com
My Name Is Earl's Alyssa Milano makes for a sexy butterfly on the red carpet.
12 of 16 Stephen Lovekin/WireImage.com
The Rose's Bette Midler couldn't have picked a more appropriate costume.
13 of 16 Steve Granitz/WireImage.com
The L Word's Marlee Matlin is as sweet as a spoonful of sugar in this Mary Poppins costume.
14 of 16 Jean-Paul Aussenard/WireImage.com
Crispin Glover goes back in time with a fetching wig. (Are those tights!)
15 of 16 Dimitrios Kambouris/WireImage.com
Sofia Coppola waves to the camera in her Native American costume.
16 of 16 John Sciulli/WireImage.com
Clint Eastwood or Entourage's Jeremy Piven There's no way Ari would dress up like that.