It appears Simon Cowell is trying to get Mariah Carey in his corner when it comes to mentoring the first U.S. “X Factor” winner.  Deadline.com reports the judge is in final negotiations to bring the singer on as his team’s celebrity mentor.  Each “Factor” judge will reportedly pick a superstar to help advise their contestants, and insiders say the Fox show is looking to bring in even more big names.  One source says organizers are making contacts with “the Beyonces, the Rihannas, all of them.”  “The X Factor” is scheduled to air Tuesdays and Wednesdays on Fox starting September 21st.

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