Stevie Nicks has said sorry for threatening to strangle Nicki Minaj.

The Fleetwood Mac singer made an unprovoked verbal attack on the 'Super Bass' hitmaker after the she had a big argument with her fellow 'American Idol' judge Mariah Carey, but Stevie has now gone back on her comments saying she ''deeply regrets'' what she said.

She told US gossip website Just Jared: ''I want to apologise for my remarks about Nicki Minaj's behaviour toward Mariah Carey which I said during a long and exhausting day of interviews.

''It was very out of character for me and I deeply regret what I said.

''I feel very protective toward Mariah Carey who has gone through many difficulties in her life and I spoke without thinking. I think all artists should be respectful toward one another and that includes me. I am truly sorry.''

At one point during Nicki and Mariah's bust-up, the 'Starships' hitmaker threatened to shoot the 'Hero' singer and filming for 'American Idol' had to be temporarily called off.

Stevie had previously said: ''How dare this little girl! ... If I had been Mariah, I would have walked over to Nicki and strangled her to death right there. I would have killed her in front of all those people and had to go to jail for it.''