WATCH VIDEO Nicki Minaj and Mariah's American Idol catfight
It's alleged that Nicki threatened fellow diva Mariah during filming in Charlotte, North Carolina.Nicki's's reported to have called the mum-of-two a b*tch - though it's claimed that Mariah started the argument.
"Nicki’s manager and team convinced her to come back to the show. Mariah kept at it and called Nicki a b*tch and then proceeded to cuss her out. Producers had to stop filming and call it a night."
The row was caught on camera and it seems fellow judges Keith Urban and Randy Jackson were caught in the middle.
In the video - posted by TMZ - Nicki rants about Mariah: "I told them I'm not f*cking putting up with her f*cking highness over there. Figure it the f*ck out. Figure it out."
Mariah is heard answering back, but it's unclear what she's saying.
The argument - which has left producers worried about the future of the series - is said to have escalated after Nicki and Mariah disagreed about a contestant's performance.
Things have apparently been tense from day one - in this season's first taping the pair were said to have talked over each other in a bid to get noticed.
And it's claimed that singing veteran Mariah resents Nicki's place on the panel as she's a relative newcomer to the industry.
A source said: "These girls just don't like each other."
Show host Ryan Seacrest hinted at the drama on Twitter.
He wrote last night: "Going to bed in Charlotte after an anything but dull day at #idol auditions. Hit u in morn."
Watch Nicki and Mariah's explosive row below...