" 'Cause one night isn't enough!" That was Gemma Ward's explanation for why she insisted on having yet another costume party, this one for her 20th birthday on Saturday night, at the end of Halloween week. "But I decided not to insist on the jungle theme—the invite said that all animals would be welcome!" Hence not everyone who showed up at the bar of the Bowery Hotel was in Amazon-appropriate looks—Lisa Cant was a bunny and, for the first part of the night, at least, Caroline Winberg was a lobster (she later changed into a leopard-print Dolce & Gabbana gown). There was certainly some costume fatigue, however: Leigh Lezark and Benjamin Cho turned up in their regular street garb, Josh Hartnett could only muster a glove that he had nicked from a friend's Halloween look, and Agyness Deyn manned the DJ booth in a cocktail dress (all was forgiven in her case, however, when she reminded guests that she had gotten off a flight from London just an hour earlier). Ward, however, didn't mess around: Her first look was a feathered bodice dress so tight she couldn't sit down. Maybe that's why, halfway through the party, she switched into a zebra-print minidress. Despite coming at the end of a long week of parties, no one seemed too tired to celebrate. "Everyone is having a great time," Winberg said on the patio. "Even my mother. She is refusing to go home!"