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Nick Cannon Beatboxes for Freestyle-Rapping Kid from St. Mary's Children's Hospital

"America's Got Talent" host Nick Cannon recently joined "Extra's" AJ Calloway in New York to chat about his new children's book, "Neon Aliens Ate My Homework," and the inspiration he gets from visiting St. Mary's Hospital for Children.

During the interview, Nick introduced Demetrius Franklin, one of the kids at the hospital, to freestyle rap while the comedian and rapper laid down a proper beat.

Check out the fun video!

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