Oh, and her husband of nine years just happens to be the new Batman.
Just don't call Jennifer Garner "Supermom."
"No," says the mother of three on whether she has cracked the code of what it takes to be that perfect mother.
Speaking at the Los Angeles press conference for her latest film, Alexander and the Terrible, Horrible, No Good, Very Bad Day, Garner also said: "But the absolute [greatest] thing about being a parent is that every day is a fresh start."
And she means every day.
"You always can say, 'Today we're going to try this!' " Garner, 42, says. "And if it goes horribly, you can say, 'Today we're throwing that out, and we're trying this!' That's part of what I like about being a mom in general."
So what's it like being a member of the Affleck household?
"Our kids need to be allowed to have a bad day," she tells PEOPLE. "And you need to show them that it's okay to have the whole range of emotions. You should have it all: rage and anger and sadness, so there is a lot of room for joy and happiness as well."
And she's happy to show off what she's learned as a parent to Violet, 8½, Seraphina, 5½, and Samuel, 2½, when the cameras are rolling.
"I have enjoyed this new world of playing moms," Garner says. "This little kid whose mom is a teacher at my child's school said, 'Mrs. Affleck is a lot like my mom ... She gets to have a lot of other kids.' "