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Then radio show and "America's Got Talent" host Nick Cannon, below left with his wife Mariah Carey and one of their twins at the BET Honors 2012 show, went on ABC's Good Morning America to discuss the details of his recent diagnosis. "It's a rare form of lupus that's attacking my kidneys," he told Good Morning America host Robin Roberts. "The technical term is lupus nephritis." No matter how upbeat he is about the diagnosis, it's a dangerous one.