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.
Intense! Kate Upton made her Halloween debut dressed in a sweet orange and white dress with the addition of some intense black spider makeup! The blonde beauty was photographed arriving at the Casamigos Halloween Party in Beverly Hills, Calif., on Friday, Oct. 25.