Hollywood dined with President Obama at the White House Correspondents' Dinner over the weekend. New couple Scarlett Johansson and Sean Penn, Mila Kunis, Jon Hamm, and countless other stars came out to hear the commander in chief as he addressed a crowd of celebs and political types — and he even poked fun at Matt Damon! Watch Obama's joke at Matt's expense, and get a look at the famous faces who got dressed up for the evening.