Derek KochAlexa Chung

From Heidi Klum's getup as an old woman at her annual Halloween party at Marquee to a party filled with ringmasters and circus-inspired partygoers at No. 8, last night, New Yorkers pulled out all the stops for wild, wacky, and over-the-top outfits to celebrate Halloween. Check out our roundup of the best-costumed guests in NYC last night!