Jennifer Garner is one hot mama!

The Odd Life of Timothy Green actress stopped by Jimmy Kimmel Live to chat with the talk show host, and she talked all about her hubby Ben Affleck and her children, including infant son Samuel.

Speaking about her husband's birthday, the Alias star revealed she celebrated a year too early! "I thought it would be cool to have a big 39th birthday. It was big and fancy and he said it was like a wedding, but whatever. All anybody said to me was 'Oh is it his 40th birthday?' and I was like 'No, it's his 39th!' Now this year when it's actually time for a big party I will be like, 'No, we did that!'" she joked.

She also revealed how the newest addition to the family got his moniker. "I really love having a baby boy. [The naming] was a fight and a struggle, but I won. He was named after Ben's grandfather," the mother of three revealed.

For their part, Violet and Seraphina couldn't be happier about the new addition! "They are very into him. They love having a little brother, they are all about it. They help a lot with diaper changes," she gushed about her daughter's love for their new sibling.

Sounds like life is grand for Jen G!