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.
The music of the night! Ryan Seacrest wore a simple white mask from the Phantom of the Opera while celebrating Halloween at the Casamigos Halloween Party in Beverly Hills, Calif., on Friday, Oct. 25.