Sean Penn and Charlize Theron have been dating pretty seriously for over a year and recently reports have surfaced that Penn is ready to become a daddy to her three-year-old son, Jackson.

Sean Penn already has grown children, daughter Dylan, 23, and son Hopper, 21, from his marriage to Robin Wright. But, is 54-year-old Penn ready to start all over with a toddler?

According to MSN, Sean Penn is going full steam ahead into fatherhood with Charlize Theron and says Jackson already calls him “Daddy”.

The couple’s reps haven’t confirmed anything, but some are taking it as a sign that the couple is ready to marry and settle into family life together.

Charlize Theron has said of the prospect of marriage, “I was single for a really long time. I was enjoying mommyhood. You just naturally become kind of selfish about your time, and all of it is dedicated to this little thing, whether he needs it or not. And then they get into more of a schedule and you start to think, Wow, wait a second. There’s this passionate creature in me.”

Is Sean Penn the one to tame that passionate creature?

She said, “Sean and I have known each other for eighteen years. We were just really good friends. And it’s been slow going because you are aware that you could screw that up and lose it. We had to think about it. But at the end of the day, it was somewhat effortless.”

She added, “It just kind of naturally happened, and before I knew it, I was in something that was making my life better — the people who really love me can see the effect it has had on me.”

Well, whether not Sean Penn is adopting Jackson remains to be seen, but they definitely make a great couple and would be amazing parents.

What do you think of the possibility of Sean Penn adopting Jackson?