Singer Katy Perry performs her song "Roar" at an event for the Special Olympics hosted by President Barack Obama in the State Dining Room at the White House in Washington, Thursday, July 31, 2014. (AP Photo/Charles Dharapak)
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Singer Katy Perry performs her song "Roar" at an event for the Special Olympics hosted by President Barack Obama in the State Dining Room at the White House in Washington, Thursday, July 31, 2014. (AP Photo/Charles Dharapak)
