Source Says That Mariah Carey Called Nicki Minaj A ‘B*tch’ Off Camera

If you're wondering what triggered the tongue lashing that Nicki Minaj gave Mariah Carey behind-the-scenes at a recent 'American Idol' audition–you're in luck! An insider tells TMZ that before the video hit 'record', Mariah referred to Nicki as the ultimate 'no-no'–a "b*tch". In fact, a source claims that Mariah called her a b*tch a number of times, during their argument (which resulted in Nicki going HAM). One source also claims that Nicki was a bit annoyed w/ Mariah because Mariah was being a brag-a-saurus (often bragging about her accomplishments, etc.). The source claims that Mariah–

'Keeps bringing up how many records she sold, name dropping people she's worked with, how many tours she's done…Nicki is tired of it."

What's Nicki or Mariah's response been? Welp, on twitter, they've both been mum. But what do you think happened? Whose side are you on?