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.
Project Retirement! Halloween costume guru Heidi Klum looked shockingly convincing dressed as an old woman, wrinkles, spider veins, and all, at her 14th Annual Halloween Party in New York on Oct. 31, 2013.
Credit: Mike Coppola/Getty Images for Heidi Klum