Years ago Mariah Carey famously shaded Jennifer Lopez claiming in an interview, "I don't know her [click here if you missed that]."
Turns out the bad blood all boils down to Mariah Carey's ex-husband Tommy Mottola...
Irv Gotti tells Desus and Mero,
“[Mottola] calls me because he found out me and Rule made a record with Mariah Carey. At the time, he hated Mariah Carey, so he was pumping Jennifer Lopez to compete, so he calls me and he says Irv I need you make a record with J.Lo but I want you to put Ja Rule on it and make it a duet.”
“Immediately when he said that, I was like, ‘This [expletive]. He knows we just did this sh-t with Mariah and he’s trying to f-ck Mariah!”Of course 'I'm Real' went on to be a massive hit for Jennifer.
Comes in at the 2:25 mark.