Zoe Kravitz and Penn Badgley stepped out last night for the launch of artist Aaron Stern's photography book Everyone Must Be Announced at NYC's Milk Gallery. There wasn't much Zoe Kravitz and Penn Badgley PDA on display, but she did hit the dance floor to show off her moves while clutching a can of Pabst Blue Ribbon. Other friends of Aaron's like Alexa Chung, musician Tennessee Thomas, and former Boardwalk Empire star Aleksa Palladino were on hand. Alexa Chung was the DJ but had enough free time to joke around and pose for photos. Zoe and Penn have been going strong for nearly four months, and we're sure to see lots more of them making the party rounds when New York Fashion Week — and its many parties – kicks off on Feb. 9.