Jon Hamm was in character on the Mad Men set in San Pedro, CA yesterday. He started filming the fourth season as Don Draper last month, and while he didn't share any scenes with costar January Jones, she's been back as Betty Draper too. On Monday, both January and Mad Men bombshell Christina Hendricks took their fashion in a more modern direction for the Met gala red carpet. Jon's small screen marriage came to a crossroad at the end of last season and as of this week he has a new fictional love in his life – he's starring in an upcoming wedding comedy with Kristen Wiig.