Nicki Minaj Puts On Phony English Accent & Tells Mariah Carey 'Simmer Down Sir!'

April 18 2013, Published 7:34 a.m. ET

Just when you thought Nicki Minaj was ready to play nice with Mariah Carey, the Super Bass singer sniped at her fellow judge on Wednesday's show, putting on a phony English accent and sarcastically telling Mariah to "Simmer down sir."

The insult came after finalist Kree Harrison's rendition of The Black Crowes' She Talks to Angels, which Mariah thought was off-the-mark.

"I disagree … that was the best performance of the night," Nicki said, to which Mariah chimed in, "I wasn't saying she was awkward … you don't really disagree with me."

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"No, I do and I'll explain," Nicki said -- at which point Mariah tried to interject again -- and she told her, "Simmer down, sir."

Carey had an embarrased look on her face, but later on in the program, Nicki gave her a compliment after Candice Glover performed When You Believe, an Oscar winning song Mariah and the late Whitney Houston collaborated on in the late 90s.

“I have to say, I remember having nothing and locking myself in my room crying watching that video because I believed every word," Nicki remembered. "That kind of collaboration has never happened since.”