230gibson090409_01_X17.jpgIt's officially the biggest divorce settlement in Hollywood history, and now Mel Gibson will be forced to fork over exactly half of his estimated $850 million.

The Oscar-winning actor's divorce from Robyn, his ex-wife of nearly 30 years, was finalized Friday in a Los Angeles courtroom. Since there wasn't a prenup, Robyn was entitled to exactly half of the actor's amassed fortune.

And that's not all. Gibson's ex will also be entitled to half of every future check he receives for the rest of his life -- that's a lotta dough!

The ex-pair, who have seven children together, will also have the task of divvying up Mel's assets, including over $100 million in real estate investments, the $600 million he made from The Passion of the Christ, and $75 million from other various film and TV projects he's executive produced.

Robyn has already been given two of the pair's Malibu estates worth an estimated $22.5 million.

Gibson first met Robyn in the late 1970s while she was working as a dental nurse. At that time, his first breakout film, Mad Max, had just hit theaters.