Pictures of Celebrities on Set For the Week of February 17, 2012

Despite those Winter blues, there were stars hard at work this week. NYC was one busy city: Penn Badgley filmed more Gossip Girl, Justin Long was on the set of his new film A Case of You, and Joaquin Phoenix continued working on an untitled James Gray project. Across the pond, James McAvoy filmed some scenes for his new film Filth. Click through to see what other Hollywood stars were busy on set this week.