They apparently rowed during the event with Keith Urban stuck in the middle...
Tensions were running high between Nicki Minajand Mariah Carey during anAmerican Idolpress conference yesterday (8th January) - with The Daily Mail reporting they the pair ended up arguing.
The judges were speaking at the Television Critics Association Winter Tour when things between Nicki and Mariah turned sour after a journalist asked them to say something nice about each other following their previous spat.
According to blog Vulture.com, Minaj was first to answer the question, stating: "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."
Carey is then said to have 'flinched' 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 favourite songs."
She added: "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."