It's that time again! Some of the biggest names in Hollywood stepped out to celebrate Halloween 2013, dressed as film characters, other A-listers, comic superheroes and much more! Check out some stars -- including Hilary Duff, Vanessa Hudgens and John Stamos -- who went the extra mile to get decked out for some of the biggest Halloween parties of the season.
You will know her name! Opinionated Brit Kelly Osbourne went gory this Halloween when she dressed as Stephen King's iconic prom queen Carrie for Adam Lambert's Halloween Party on Oct. 31, 2013.