Mariah Carey -- 'A Nightmare to Work With' On 'American Idol'

Mariah Carey was a "nightmare to work with" during her brief stint as a guest mentor on "American Idol" in 2008 -- this according to sources on the show.Sources tell TMZ, Mariah -- who made her mentor cameo on "Idol" Season 7 -- was incredibly late for…

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Source: http://www.tmz.com/2012/07/23/mariah-carey-nightmare-american-idol-judge/

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