Already?  Yep!  It all took place on the set during an audition for American Idol's Season 12 in Charlotte, North Carolina. 

Mariah Carey Ryan Seacrest and Nick Minaj-americanidol.com

So what exactly happened? The two women disagreed over a contestant's performance and it got so bad that American Idol had to cancel auditions for the rest of the day.  Plus, sources are saying Nicki even threatened Mariah after the tape stopped running.

In the TMZ video below it shows the panel of judges with Nicki yelling about Mariah saying things she didn't appreciate.  Nicki said, "I'm not going to take it back, and if you've got a f---ing problem, handle it.  I told them, I'm not f---ing putting up with her f---ing highness over there."

At which point you can hear Carey say, "Ohhhhh, why, why, why?" I could be at home with children instead of dealing with this."  Then Nicki says, "Good, well then go see them now. Go see them now!"

It looks like American Idol Season 12, is gonna be pretty interesting and for more reasons than one.  I will keep you posted with any further details.