Bobby Flay Files For Divorce -- Wife Skewered by Prenup

Bobby Flay has pulled the trigger and filed for divorce, TMZ has learned, and we're told their prenup has already become a major bone of contention.

Bobby says in his legal docs his 10 year marriage to Stephanie March has "broken down irretrievably." TMZ broke the story the couple separated 3 weeks ago.

Turns out they signed a prenup when they married back in 2005 and we're told it really favors Mr. Flay. Our sources say it was signed in 2005, when Bobby was already a multi-millionaire and Stephanie was a mid-level actress.

They have no kids together, so we're told they're squabbling over property. We're told she's mighty unhappy with the prenup.

Sources connected with Bobby say he's "heartbroken" the marriage has come to an end, but still cares for Stephanie.