Demi Lovato performs 'Skyscraper' on 'America's Got Talent'
Demi Lovato performed her hit single 'Skyscraper' live for the second time, this time on the 'America's Got Talent' stage.
On April 2 American singer-songwriter Demi Lovato performed her single ``Heart Attack'' live on the ABC reality competition show, ``Dancing with the Stars''.