EXCLUSIVE

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.