Stevie J Tells Nick Cannon He Smashed Mariah Carey Twice

Nick Cannon got more than he bargained for when some "Love & Hip Hop: Atlanta" stars went on his show and one bragged about banging his estranged wife.

Stevie J and Joseline Hernandez were guests on "Wild 'N Out" Monday when the 2 ex-lovebirds squared off during the rap battle against Nick and his crew. It started out all fun and games, but got progressively nasty. At one point Stevie J said he banged Mariah Carey not once but twice.

Nick got pissed off, and then told Stevie J he should worry about Joseline because she was sleeping with Rick Ross.

It got down and dirtier, to the point Nick threatened the old Hollywood adage, "You'll never work in this town again," because he has so many TV shows and connections.

Eyewitnesses tells TMZ it looked like they were about to come to blows, so producers stepped in, separated them and calmed them down.

Cam said it too …….

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