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Neil Patrick Harris, Heidi Klum, and Alec Baldwin Won Halloween 2017 — See More Celeb Costumes!

Another year, another crop of amazing celebrity Halloween costumes! From circus performers and The Wizard of Oz characters to a scary werewolf and a '70s disco queen, your favorite stars pulled out all the stops with their festive outfits on Oct. 31! Scroll down to see the best costumes from Halloween 2017!