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NEW YORK, NY - AUGUST 01: Christina Perri (C) and her band attend 'Late Show With David Letterman' at the Ed Sullivan Theater on August 1, 2011 in New York City. (Photo by Taylor Hill/FilmMagic)

NEW YORK, NY - AUGUST 01:  Christina Perri (C) and her band attend 'Late Show With David Letterman' at the Ed Sullivan Theater on August 1, 2011 in New York City.  (Photo by Taylor Hill/FilmMagic)