ABC News' Rosalyn Oshmyansky reports:
Before the official swearing in today or the unofficial swearing in Monday, young supporters of President Obama celebrated their contribution to his reelection with their own special party.
Nearby in Washington on Saturday night the first tweens - Malia and Sasha - and first lady Michelle Obama attended a Kids Inaugural Ball at the Washington Convention Center in an event to honor military families.
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Between the two youth-oriented balls, the nation's capitol became quite the hot spot. The Kids Inaugural Ball featured performances by Usher and Katy Perry, who wore an American flag. Over at the Youth Ball, John Legend, Common and T-Pain performed.
For the Ourtime.org Youth Ball, the National Portrait Gallery turned into a red carpet event with celebrities, politicians and young entrepreneurs who were all greeted by the media behind velvet ropes.
Rappers Common and T -Pain relayed the importance of the youth vote before their performances.
Common encouraged the youth vote.
"It means you care about your world if you vote," he said. "If you didn't vote this time, there's always next time."
T -Pain also had a message for the youth: "Make sure you know your point of view. Make sure you know the facts."