Jon Hamm joined his Mad Men costars Kiernan Shipka and Elisabeth Moss for a TV academy screening hosted by AMC in LA last night. John Slattery was on hand along with the show's creator, Matthew Weiner, who revealed that he already has an idea of how Mad Men will ultimately end despite their having a contract for three more seasons. Absent from the event were leading ladies Christina Hendricks and Allure cover girl and X-Men: First Class star January Jones. Jon made it to the stage following a trip to Cannes, where he partied with longtime girlfriend Jennifer Westfeldt at the Paradis charity bash during the city's film festival. Jon also has been celebrating the success of his comedy Bridesmaids, which landed in second place at the box office on its opening weekend.