GOOD MORNING AMERICA - Demi Lovato performs live from Central Park on &#34;Good Morning America,&#34; 6&#47;28&#47;13, airing on the ABC Television Network.   &#40;ABC&#47;Donna Svennevik&#41; ROBIN ROBERTS, DEMI LOVATO <span class=meta>(ABC Photo&#47; Donna Svennevik)</span>
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