Beyonce, Jay-Z, Katy Perry, John Mayer and other stars at 2013 Presidential Inauguration

Slideshow posted in Photos | Monday, January 21, 2013

13 of 25: Kelly Clarkson performs 'My Country 'Tis of Thee' after President Barack Obama's ceremonial swearing-in ceremony during the 57th Presidential Inauguration. ( Photo / ABC News)

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