Evidence of their feud first came to light in October when the warring pair were seen locked in a vicious catfight in leaked audition footage from the show.
And as the pair attended a press conference ahead of the new series yesterday, relations didn't look to have thawed, despite protestations from them both.
The pair threw daggers and rolled their eyes at each other throughout, but one journalist tryed to diffuse the tension by asking them to pay each other a compliment.
Cue gritted teeth and insincere comments.
Going first, Nicki said: "I say nice things about Mariah all the time. She is one of my favourite artists of all time.
"To be on a panel with her, it's kind of crazy. All the singers come in aspiring to be Mariah, in terms of talent and in terms of career length."
According to reports, Mariah 'flinched' at Nicki's answer before replying: "That was a very sweet thing to say.
"We did a song that was from my album and it was called, ironically, Up Out My Face. It was one of my favorite songs."
She continued: "And I did feel like she was going to go very far and still have that feeling. I am grateful for anything nice that she or anyone has to say."
But when asked about the famous spat that was caught on camera, the claws were soon back out again.
"It was sort of a one-sided thing," Mariah said.
"No, it wasn’t!' Nicki snapped back. "See? They don’t want a rising star, they want drama."
Meanwhile, Mariah has admitted that she has beefed up her security after their infamous spat, in which Nicki allegedly threatened to shoot her.
"It felt like an unsafe work environment," Mariah told Barbara Walters in an interview on ABC News.
"Anytime somebody's reeling threats at somebody, you know, it's not appropriate. I've got two babies... I'm not going to take any chances. I did hire more security. I felt it was the appropriate thing to do."
> WATCH MARIAH'S INTERVIEW WITH BARBARA WALTERS BELOW