Mel Gibson's Girlfriend Really, Truly Pregnant

Actor reveals during Tonight Show taping that he's expecting a baby with Oksana Grigorieva; it will be his eighth child

Mel Gibson's family tree is growing in a new direction.

The soon-to-be divorced actor is expecting a child with girlfriend Oksana Grigorieva, rep Alan Nierob confirms to E! News.

Apparently, Gibson shared the news with pal Jay Leno during a recent Tonight Show taping for an episode that will air this week—Leno's last at the helm of the NBC chatfest.

"I guess I'm Octo-Mel," quipped Gibson, 58, who has seven kids with his estranged wife, Robyn.

Not that this is the first we've heard of a possible Gibson-Grigorieva baby. The chatter has been rampant for several weeks, ever since the two stepped out publicly as a couple last month at the X-Men Origins: Wolverine premiere in Los Angeles.

Grigorieva, 39, has a son with actor Timothy Dalton.

Robyn filed for divorce on April 13 after 28 years of marriage, citing irreconcilable differences as the reason for the split. Gibson's subsequent counter petition, however, stated that the pair had been separated since August 2006, not long after the Braveheart star's ignominious DUI.

"My wife and I, our marriage ended three years ago and we've been separated ever since then," Gibson told Leno. "These things happen. It's unfortunate, it's sad, but you know, she is an admirable woman—we still got kids together, we're friends.

"Look, when it's all said and done, I did a pretty good hatchet job on my marriage myself. I'm to blame. If you're inclined to judge, put it here."