Mel Gibson sat his children down and announced that his Russian girlfriend is pregnant with his love child, a Gibson family friend told The ENQUIRER. (How is he going to take that baby to his ultra-conservative Catholic Church to be baptized? A baby conceived while he was married to somebody else. Practice what you preach Mel!)

The kids were stunned by the news, and the pregnancy bombshell has set the stage for a bitter battle over the Braveheart star’s billion-dollar fortune, sources reveal.

The Oscar winner’s two oldest boys – 26-year-old twins Edward and Christian – will hire an attorney to protect their trust funds, and insiders expect his estranged wife Robyn will seek more than half of his assets.

At the center of the battle is Mel’s girlfriend Oksana Grigorieva, 39, who is about three months pregnant, according to the family friend.

“In late April, Mel gathered his children at the family home in Malibu and broke the news that Oksana is pregnant, and he expects them to accept the baby as a new sibling,” the friend told The ENQUIRER.

“They are quite upset,” the source revealed. “Even though Mel assured them the pregnancy was unplanned (on his part probably not on hers), they’re furious with him and say they’re going to take steps to protect their inheritance, which they feel is in jeopardy”. (Hopefully they are more concerned about their mother’s feelings than money.)