Jennifer Garner With Samuel and Seraphina Birthday Party

Jennifer Garner had a busy afternoon in LA with her two youngest children yesterday. She took Samuel and Seraphina to a friend's birthday party and later popped up at a park with Seraphina. Jennifer hung out around the playground with Seraphina and helped her ride down the slide. Jen got back to her weekly routine with the kids after an exciting Mother's Day on Sunday. It was her first as a mom of three kids and her husband, Ben Affleck, showed his love and appreciation for her in a sweet Facebook message. Ben called Jen a "world-class mom" and praised all that she does for their family. Ben even gave Jen a break last Saturday when he took Violet and Seraphina out shopping and they happened to run into Halle Berry and her fiancé Olivier Martinez.