Ben Affleck picked up his car from a valet stand this morning after running an errand in LA. He spent the weekend celebrating with wife Jennifer Garner as she turned 39. In honor of her big day, Ben, Violet, and Seraphina treated Jen to a family dinner on Saturday and followed it up with a large backyard bash for their friends and family yesterday. Ben's pal Matt Damon dropped by Jennifer Garner's party with his wife, Luciana, and their daughters Gia and Stella. Ben is back with his three main ladies following a recent scouting trip to Turkey, where he also spent time checking out flooring options at a local rug store. Ben's next film, an untitled project by Terrence Malick, is set to open in 2012; however, the director will debut his highly anticipated Brad Pitt film Tree of Life next month at Cannes.