The two, who were filmed during an explosive feud about a contestant (see video above) during auditions on Tuesday in North Carolina, are continuing the argument off set.

Fellow judge Keith Urban was stuck in the middle of the pair during the blow-up, in which Nicki was recorded saying: “I told them I'm not f--kin' putting up with her f--king highness over there.

“Figure it the f--k out. Figure it out.”

Now veteran TV journalist Barbara Walters has got herself involved in the row.

Mariah sought the advice of The View host following the war of words and called her to talk about the incident, saying the worst part wasn’t even captured on video.

“She said that when Nicki walked off the set, multiple people heard her say, 'If I had a gun I would shoot that bitch’," Barbara revealed on The View.

"And she said there were staff members that heard - hairdressers, producers and other people. She said she's very concerned. She is with her twins and doesn't feel that anything would happen, but 'Nicki is unpredictable’. Mariah says she can't take a chance and has hired extra security."

The interference didn’t go down well with 29-year-old singer Nicki, who took to Twitter to slam the claims.

“Ironically no camera or mic heard the gun comment though," she tweeted. "LOL at the struggle. Not even the producers believed you. Say no to violence barbz.

“I don't call TMZ and Barbara Walters because I stand on my own two feet. Never needed an army. God is good. Insecurity is as cruel as the grave," she wrote.

"I guess it hurts to have the producers tell you to your face that Nicki is the best judge we've had since Simon. Awww, poor you. Keep them lies coming."

Mariah’s husband Nick Cannon has also spoken out in defence of his wife. “[Mariah] is the strongest and the classiest woman I’ve ever met,” he told Access Hollywood “She signed up to do a job to help young people accomplish their dreams and [the spat] is like a sidebar. I hope that’s not what this show becomes about, the catfights.”