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"In DC preparing to sing for President OBAMA!!" the YouTube singing sensation wrote on his Twitter prior to the live performance. "Yeah im nervous. if i mess up he might deport me back to Canada. Lol."
Justin delivered a Christmas tune called "Someday at Christmas" during the gig. Host George Lopez introduced his performance saying, "Like you, Mr. President, this young man has many fans trying to shake his hand without permission."
Other musical guests were Mary J. Blige, Rob Thomas, Neil Diamond and Sugarland. Taking place at the National Building Museum on December 13 and will be aired on December 20 at 8 P.M. ET/PT, the concert is aimed to benefit the National Children's Medical Center.
source: aceshowbiz.com