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.
LOL! Nicole Richie and a male friend went as Arnold Schwarzenegger and Danny Devito from the film Twins. The mother of two shared the hilarious snapshot via Instagram.