FILE - This dec. 16, 2012 file photo shows actress-singer Demi Lovato 

FILE - This dec. 16, 2012 file photo shows actress-singer Demi Lovato performing at VH1 Divas at the Shrine Auditorium in Los Angeles. Lovato's  “Heart Attack,” was the most viral tracks on Spotify, based on the number of people who shared it divided by the number who listened to it, from Monday, Feb. 25, to Sunday, March 3.  (Photo by Chris Pizzello/Invision/AP, file)
Associated Press
FILE - This dec. 16, 2012 file photo shows actress-singer Demi Lovato performing at VH1 Divas at the Shrine Auditorium in Los Angeles. Lovato's “Heart Attack,” was the most viral tracks on Spotify, based on the number of people who shared it divided by the number who listened to it, from Monday, Feb. 25, to Sunday, March 3. (Photo by Chris Pizzello/Invision/AP, file)
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