I know this will be shock to everyone…but Mel Gibson has decided not to stick around and be ‘late-life-dad’ to his 5-month-old daughter with Oksana Grigorieva.

“They just drifted apart,” says a close friend of the couple of the amicable split. “They’re both working hard on their careers and trying to raise a sweet baby together. They’re still friends and they’ll both raise Lucia together.”

Translated: They’ve come to a financial agreement and Oksana probably doesn’t want his old-cranky ass around anyway.

Mel and Oksana split