Mariah2X.jpgMariah Carey is back! The singer will mentor contestants on the upcoming U.S. version of The X Factor, reports Deadline.

Each X Factor judge will have a superstar mentor their respective contestants, and Simon Cowell is in final negotiations to have Mariah Carey mentor his.

Cowell had wanted Carey involved in the show since its inception, but her pregnancy and the birth of her twins complicated her options.

Celebrity mentors are an interesting idea -- it's like X Factor is combining The Voice with American Idol! It will be interesting to see if all three shows can survive ...