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

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