Sean Penn was having a blast playing daddy for Charlize Theron's son, Jackson, on Monday. The adorable pair looked like they were enjoying some quality time together as they awaited Charlize's return from Melbourne, Australia.

Sean and Jackson before scooping up Charlize, whom the Milk actor has been dating since last January, and heading home. The leggy blonde was down under to attend the Australian Grand Prix as an ambassador for Capitol Grand, a luxury development in Melbourne.

While Jackson's mama may have been out of town -- it looks like he was in good hands with Sean!

We know how rough and tough the Oscar winner is known to be -- so it warms our hearts to see him with Charlize's little boy -- and it certainly looks like Jackson has warmed Sean's gruff heart!