Minaj, 30, attacked the Always Be My Baby singer on Twitter Thursday morning calling her bitter and insecure with no personality.
The current rumblings between the two was fuelled by a series of heated exchanges on American Idol Wednesday night when Mariah, 43, taunted the Super Bass star for never having a number one single on the Billboard Hot 100 chart.
During the show, Nicki fought back Mariah’s jibes by breaking out a cotton swab and telling the diva to clean out her ears.
“Why a woman SO successful at her age, is still so INSECURE, and bitter,” Nicki wrote in a series of messages aimed at Mariah.
“All dem #1s but JLo phone ringin? Lol. I guess having a personality, being a secure woman, and giving genuine critique still trumps that,” she vented.
As RadarOnline.com previously reported, Nicki and Mariah’s feud has been escalating in recent months. During a live April 17 show, Nicki sarcastically told Mariah to “simmer down, sir” in a British accent after a disagreement over 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.”
“No, I do and I’ll explain,” Nicki said — at which point Mariah tried to interject again — and she told her, “Simmer down, sir.”