WATCH: Nicki Minaj Goes Off on Mariah Carey During 'American Idol' Taping

The bad blood between newly minted "American Idol" judges Mariah Carey and Nicki Minaj came to a head today during auditions in Charlotte, when Nicki Minaj went OFF on a tirade and told Mariah: "I'm gonna knock you out." Wait, what?! According to the folks over at TMZ who got their messy hands on the tape, the auditions were canceled for the rest of the day so the two judges could calm down. The