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Selena Gomez performs on 'Good Morning America,' celebrates birthday

<div class="meta "><span class="caption-text ">Selena Gomez celebrates her 21st birthday with a concert in Central Park as part of the GMA Summer Concert Series, on &#39;Good Morning America&#39; on July 26, 2013. (ABC Photo&#47; Donna Svennevik)</span></div>
July 26, 2013 9:43:56 AM PDT