This past weekend, although you may not have recognizedthem, some of Hollywood’s biggest stars were out to celebrate Halloween! Somestars were on red carpets posing as their favorite super heroes while otherswere spotted spending time with their families Trick-or Treating! Check outthese pictures of your favorite stars-- dressed as their favorite stars!

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Heidi Klum’s annual costume party brought out some of thebest! Heidi Klum, Seal, Ashanti, and Kim Kardashian all dressed up for theoccasion in New York City!

Liv Tyler was spotted out with her son Milo dressed up forsome Trick-or-Treat fun in New York City! How cute!

How I Met Your Mother star, Alyson Hannigan was all smilesas she showed off her adorable daughter Satyana’s sock monkey costume withhusband Alexis Denisof! She is adorable!

Jamie Lee Curtis hosted the 17^th Annual DreamHalloween benefit dressed as an energetic cheerleader! Other stars that showedup in the Halloween spirit were Eclipse star Booboo Stewart, The Bachelor beauty Melissa Rycroftdressed as Snooki, Cougar Town star Busy Philips dressed as Tinkerbell and Tori Spelling posed with herhusband Dean McDermott and their children!

The beautiful Kate Beckinsale dressed as the Bride ofFrankenstein and hit the town to collect some candy with her young daughter Lily!Of course Kate was accompanied by her husband who was dressed as Frankensteinhimself!

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Kate Hudson’s party also brought out some big names! Letter’sTo Juliet star Amanda Seyfried opted for comfort dressing as a dog while, GwenStefani, Tony Kanal, and Will Young of the pop/rock band No Doubt all hit theparty dressed to impress!

 Judd Apatow and Leslie Mann got all dressed up to save the day for Ms. Hudson’s big party and stylist to the stars Rachel Zoe also made a stop by the star studded party. 

Looks like even your favorite stars like to dress up forHalloween! Who was your favorite?

Photos courtesy of Fame Pictures