Ne-Yo's Big Secret -- I Used to Be Married!

Ne Yo reveals he was married 11 years ago.....

From Tmz, "Ne-Yo was MARRIED!!! Ne-Yo was leaving Supperclub in L.A. this week when we randomly asked if he'd ever gotten hitched.

Ne-Yo told us he actually WAS married 11 years ago when he was 19 -- but he and his wife were only together a few months before they got an annulment.

He said, "Nobody really knows that. Nobody ever really asked."

You gotta see the video ... Ne-Yo mocks his ex, explaining she never thought he'd make it in music.