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Ben Affleck and Jennifer Garner were spotted with their youngest daughter Seraphina on Tuesday afternoon, and later the actor hit the premiere for his latest flick, To the Wonder, where he revealed that he's going to be on daddy duty this summer!

"[Garner] told me to go to the gym, I'm preparing myself," Affleck joked to reporters on the red carpet. "I'm going to take on some more of the burden ... She's got a couple of movies coming up. There's going to be a little Mr. Mom action and I'm going to get back in the ring."

Garner recently told The Telegraph, "Ben's always saying, 'You need to work, it's a part of you and you're a different person when you're working.' I've reserved this summer [for work]. It's mine.'" Maybe he didn't think she'd take his advice so seriously? After all, he said in an interview last year that he "[doesn't] want to be a stay-at-home dad." Hmm...