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.
Christina Millian, Jenna Ushkowitz and Shenae Grimes
Going green! Christina Milian dressed in an army colored spandex jumpsuit alongside pals Jenna Ushkowitz and Shenae Grimes for Halloween. The Glee star wore air force gear as the former 90210 star dressed as Poison Ivy from Batman. The ladies were photographed in costume arriving at the 3rd Annual Midori Green Halloween bash at Bootsy Bellows in West Hollywood, Calif., on Oct. 29.