TMZ.com: Nicki Minaj and Mariah Carey -- Already at Each Other's Throats on 'American Idol'

TMZ.com Celebrity Gossip and Entertainment News, Covering Celebrity News and Hollywood Rumors. Get All The Latest Gossip at TMZ - Thirty Mile Zone.

Nicki Minaj and Mariah Carey -- Already at Each Other's Throats on 'American Idol' Sep 17th 2012, 13:30 Mariah Carey wasted no time proving what we told you 2 weeks ago -- there's only room for one diva on "American Idol."Carey and Nicki Minaj went at it during the first "A.I." taping Sunday in NYC.  When Nicki started critiquing a contestant,…

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