Not even the "traditionalist" Catholics can keep it together! Mel Gibson's wife Robyn has filed for divorce, citing irreconcilable differences. Married in 1980, the couple has seven children together and millions of Passion-of-the-Christ dollars.

Back in 2006, Mel was estimated to be worth $900 million, and since there was no prenup—who got those when the husband was just a weirdo Australian in 1980?—Robyn is legally entitled to half. She's sought joint custody of their one child who is still a minor, Tom, age 9. Mel's publicist has put out a statement for both of them:

"Throughout our marriage and separation we have always strived to maintain the privacy and integrity of our family and will continue to do so."

So, sigh. The sanctity of marriage gets even... sanctityer. Really, the poor lady has put up with a lot. We think she's earned that half a billion bones.

[TMZ]