KEITH Urban threatening to quit American Idol.

KEITH Urban has been threatening to quit American Idol.

The country music superstar is furious that his co-judges Mariah Carey and Nicki Minaj are at war.

“They don’t pay me enough to have to deal with this crap,” Keith said, according to the National Enquirer. Urban’s said to be taking home around $4m a season.

“Keith knew there’d be friction between the two women, but had no idea how vicious and threatening it would become,” said a source.

“What makes him uncomfortable is the level the animosity has escalated to – and where it could go from here. And his wife, Nicole Kidman, is concerned as well.”