Nicki Minaj & Mariah Carey Fight Caught on tape ''Nicki Minaj derailed the "American Idol" auditions in Charlotte, North Carolina today, after swearing at Mariah Carey and threatening, "I'm gonna knock you out" ... sources tell TMZ.

Nicki Minaj derailed the "American Idol" auditions in Charlotte, North Carolina today, after swearing at Mariah Carey and threatening, "I'm gonna knock you out" ... sources tell TMZ.

You've heard rumours that Nicki Minaj and Mariah Carey are not best of friends on the set of American Idol, right? Well, the rumours are true. The AI set had to be shut down in North Carolina on Tuesday after Nicki Minaj blew up on Mariah Carey and it was all caught on tape...

According to Mouth to Ears this is what happened,

Nicki Minaj walked off set because Mariah Carey kept making jabs at her. Nicki’s manager and team convinced her to come back to the show. Mariah kept at it and called Nicki a bitch and then proceeded to cuss her out. Producers had to stop filming and call it a night.

Now see the video after the cut...