Mary J. Blige, Clay Aiken Loved Singing For '30 Rock'
Clay Aiken and Mary J. Blige both said they loved guest-starring on the season finale of "30 Rock," where they performed in the "Kidney Now!" benefit show.
VH1 News — Clay Aiken and Mary J. Blige both said they loved guest-starring on the season finale of "30 Rock," where they performed in the "Kidney Now!" benefit show. more info