Daddy Ben is back in town!

Jennifer Garner with Ben Affleck took their three young children to a pool party at Matt Damon's home in Brentwood today, and Violet, Seraphina and baby Samuel will have plenty to do, seeing as Matt and wife Luciana have four girls (Isabella, Gia and Stella, plus Alexia, Luciana's teenage daughter from her previous marriage).

Ben was in charge of the girls while Jen carried their 7-month-old son inside, and even though he's been busy working on back to back projects (first Argo and now Runner Runner), he seems happy to be back on parent duty. While Jen recently told Extra that raising three kids is "absolute chaos," she revealed that her hubby helps out when he can. “Ben took a break [from shooting], he came, he did the school drop-offs and pick-ups and bedtimes."

Wonder when he's heading back to Puerto Rico to resume work on his latest motion picture?