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BURBANK, CA - APRIL 20: Singer Christina Grimmie attends Tubeathon 2016 at iHeartRadio Theater on April 20, 2016 in Burbank, California. (Photo by Paul Archuleta/FilmMagic)

BURBANK, CA - APRIL 20:  Singer Christina Grimmie attends Tubeathon 2016 at iHeartRadio Theater on April 20, 2016 in Burbank, California.  (Photo by Paul Archuleta/FilmMagic)