You read it here first – Mel Gibson is an Octo-Dad!

As RadarOnline.com was first to report on Sunday,  Mel's fiancé Oksana Grigorieva gave birth to their baby -- a heathy baby girl named Lucia.

Oksana gave birth at an undisclosed hospital in the Los Angeles area on Friday, a few weeks early but a source tells RadarOnline.com that everything went well and mom and daughter are doing just fine. In fact, RadarOnline.com has learned that mom and the baby are already home.

It was RadarOnline.com that first uncovered Mel’s affair with Oksana. We published a series of photos of the cozy couple in Costa Rica earlier this year, before the public had any idea that Mel’s marriage was apparently kaput.

PHOTOS: Mel And Oksana Get Passionate On The Beach In Costa Rica

Mel’s wife Robyn filed for divorce in April, 2009, shortly after the photos were public and Mel admitted he was romantically involved with Oksana. And once she turned up pregnant he put a ring on it. He has not announced a wedding date. (Mel and Robyn were married 29 years; their marital assets are estimated at $900 million.)

READ: Mel's Divorce Filing Claims He & Robyn Separated in August, 2006!

Mel has six sons and one daughter with Robyn.               

Oksana, a Russian beauty, has a son with James Bond star Timothy Dalton. She is an accomplished musician and composer who is still hoping to launch her career, and released her album Beautiful Heartache in July, through one of Mel’s companies. Mel’s money goes a long way: The once-obscure beauty recently “found” the money to hire powerhouse Los Angeles legal firm Lavely & Singer to sue a man she formerly worked on several songs. That suit has been settled.

VIDEO: Mel Tells Jay Leno That Oksana Is Pregnant.

PHOTOS:  Mel & Oksana Out On The Town

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• Oksana Grigorieva
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• Timothy Dalton