"She keeps bringing up how many records she's sold, name dropping people she's worked with, how many tours she's done, and how many Grammys or awards she's won... Nicki is tired of it," the source told TMZ of Carey.
Host Ryan Seacrest tried to put out the flame on his KISS-FM radio show on Wednesday morning.
"It got heated between Nicki and Mariah," Seacrest admitted. "It was intense! I'll be honest with you... It went far last night. It did get intense."
"These are all very different individuals with different perspectives and different opinions that provide for interesting conversation and dialogue and feedback for the contestants."