Actor Ryan O'Neal has become a great-grandfather.

The Paper Moon star, 72, posted a family photo from a Memorial Day weekend party on his page on Monday (27May13) and revealed to fans the family had welcomed a new member.

In the picture, O'Neal holds a baby boy on his lap and adds, "Happy Memorial Day to all. I had a great day with friends and family, including new edition (sic), baby Sidney O'Neal."

O'Neal did not specify whose child he was holding but editors at claim Sidney is the grandson of the actor's son Griffin.