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Two of America's most popular pop stars got ready to ruuuuuuuumble at President Barack Obama's inauguration on Monday.

In one corner: Kelly Clarkson and her rendition of “America.”

In the other: Beyonce and her interpretation of “The Star-Spangled Banner.”

Check out FoxNews.com's full coverage of the 2013 presidential inauguration

At the end of Clarkson's "America," Chuck Schumer exclaimed to the crowd: “Wow!”

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During Beyonce's "Star-Spangled Banner,” the singer dramatically dropped her earpiece, prompting one watcher to tweet: "Taking out the earpiece is Luke turning off the targeting system in the Death Star trench."

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