Harley Viera Newton Jacquelyn Jablonski, Jason WuPiera Gelardi

NYC was in full Halloween mode over the weekend, with some of our favorites donning their best costumes to attend various parties arount the city. In today's best dressed guests roundup, we've put together the top costumes that managed to catch our attention, from Alexa Chung's Hamburglar getup to Jacquelyn Jablonski's creepy corpse bride look.