Jennifer Garner does not want any more children.

The Butter actress currently has Violet, six, Seraphina, three and six-month-old son Samuel with husband Ben Affleck, but while she admits she is happy to stop expanding her family, she is worried about Ben's "wonder sperm" getting her pregnant again.

Speaking in excerpts from The Ellen DeGeneres Show to be shown tomorrow, she said, "No I definitely, I plan to be done. But my husband is kind of a wonder sperm kind of guy."

Jennifer also reveals The Town actor Ben is very good at playing with his young daughters. "You know his girls are so into him. He kind of excels at playing baby doll!" she added.

Speaking recently, Ben said he was concerned he was not around his children enough and relied on Jennifer to provide for them. "I am not very present in the rest of my life. My wife's very patient. She does everything. If I have time, I try to spend time with my kids, even if just to be a physical presence, the bath, whatever," he said.