When Jen G is away, Batman picks up the slack!

Ben Affleck spent the weekend on daddy duty with his three kids, and he didn't just stay home and let his brood eat junk food!

The actor cheered son Samuel on at his t-ball game, and then took his children to Sunday church services. Meanwhile, mom Jennifer Garner was in Oklahoma visiting her mother at their family farm. She's also been hard at work on Lena Dunham's new show Camping, so they've been doing their best to co-parent.

The Oscar winner and mistress-turned-girlfriend Lindsay Shookus are still together, but he hasn't yet introduced her to his kiddos. He has, however, brought her around close pal Matt Damon, and according to reports, the Good Will Hunting star isn't the biggest fan!

"[Matt] thinks she is controlling and manipulative," a source told In Touch, noting that he thinks she is "bad news" for his BFF. "She likes to drink and Ben [who recently went to rehab] shouldn't be around that. Matt doesn’t think she measures up to Jennifer [Garner]," the source added.

We're still hoping Ben and Jen decide not to finalize their divorce!