Jon Hamm ran errands along West Hollywood's Melrose Avenue yesterday. He opted for a casual leather jacket and sneakers, but on Sunday he was decked out in a suit to party at InStyle's Golden Globe afterparty with his fellow Mad Men costar Elizabeth Moss and 30 Rock's Jack McBrayer. Jon and Elizabeth's TV drama returns on March 25 with a two-hour season premiere. Until then, Jon's got his hands full with two other projects. He's starring alongside his real-life girlfriend Jennifer Westfeldt in their romantic comedy Friends With Kids, due out March 9 — check out the hilarious Friends With Kids trailer! Jon and Jennifer are also lending their voices to the Feb. 20 episode of PBS animated series Martha Speaks.