He's really part of the family! Sean Penn carries Charlie Theron's son Jackson

Sean Penn and Charlize Theron's relationship seems to be going from strength to strength as the actor spends for time with her family.
And this couldn't have been more clear than on Tuesday, where Sean, 53, was spotted holding Jackson in his arms, while Charlize, 38, walked beside them, after grabbing lunch in Malibu.
The two-year old looked more than comfortable in Penn's arms, and together, the three were the picture of familial bliss.

One happy family: Charlize Theron and Sean Penn go for lunch with her son Jackson in LA

Still going strong: The couple made their relationship public at his Help For Haiti fundraising gala earlier this month