Jon Hamm flashed his dapper smile yesterday on the NYC set of Friends With Kids. He worked alongside his longtime girlfriend Jennifer Westfeldt, who also wrote the movie. Jennifer and Jon are set to share the screen with Megan Fox, though she's currently in LA with husband Brian Austin Green. Ed Burns, an actor based in the Big Apple, rounds out the cast. Jon and Jennifer have collaborated on big screen projects before, as he had a part in her 2001 movie Kissing Jessica Stein. He and Jennifer are inseparable when it comes to their free time as well, and they made a cute duo on the red carpet and at afterparties at Sunday's Golden Globes.