Gibson_Divorce.jpgYeah, we're kinda surprised this hasn't happened sooner too!

Mel Gibson's long-suffering wife Robyn has filed for divorce citing irreconcilable differences.

The divorce papers were filed in Los Angeles on April 10th.

Robyn could walk away with a pretty big chuck of Mel's estimated $900 million fortune. The couple have been married since 1980 and do not have a pre-nuptial agreement.

The former couple have 7 children, but just one son, 10-year-old Tom, still lives at home. Robyn is asking the court for joint custody.

Powerhouse divorce attorney Laura Wasser (she was Britney's divorce lawyer) is repping Mel's soon-to-be ex wife.

Stay tuned - this one is going to be interesting!!!