Battle of the divas! Tensions between the newly minted American Idol judges exploded in October, when a tape showing Nicki Minaj cursing out Mariah Carey during an Idol audition made its way onto TMZ. Multiple sources confirmed that Minaj threatened, “If I had a gun I'd shoot that f---ing b-tch” as she walked off the set, while an Idol source told People. Carey "has been saying little things to jab at Nicki from day one of shooting.” Bottom line? Millions will turn in to see the duo in action once Idol premieres in January.