Trick or Treat! See Hollywood's Best Halloween Costumes (PHOTOS)

Jessica Napoli

It was a spook-tacaular night! Hollywood's top celebs celebrated Halloween in their best costumes at George Clooney and Rande Gerber's Casamigos Halloween Party last Friday. On Sunday, across town, at Ciroc Kicks Off Halloween with Lenny S. & Kelly Rowland's Costume Couture at Poppy, even more A-listers stepped out in some boo-tiful costumes.

Halloween Flashback: 10 Spook-tacular TV Guide Magazine Covers

Halloween Flashback: 10 Spook-tacular TV Guide Magazine Covers

From 'Sabrina the Teenage Witch' to 'The Addams Family,' these are some of our favorite Halloween covers.

Click through the gallery above to see what your fav celebs wore.