2013 Presidential Inaugural Ball Gets Fun.: Watch Here!

The Grammy-nominated band took the stage to welcome President Barack Obama's second term.

For those trying to keep track of all the star power and A-list performers who descended upon the nation's capital for President Obama's second inauguration over the weekend, it was a difficult task due to the seemingly endless list of events, concerts and balls. And just when we thought things were winding down on Monday (January 21) evening following an action-packed weekend of pomp and circumstance, the stars once again came out in full force to support the president at not one but two inaugural balls.

The official Inaugural Ball was so massive that it had to be spread over five different exhibit halls in the Washington Convention Center, which naturally allowed for more attendees — who numbered in the thousands — and more performers. One of the acts who received the extra-special invitation to perform at the event was one of music's biggest success stories of last year: Fun.

The smartly dressed, suited-up group kicked off their energetic performance with their current hit "Some Nights," followed by "One Foot," which included mid-song encouragement from frontman Nate Ruess in which he asked the audience to sing along. The six-time Grammy nomineescontinued their lively set with their latest single, the inspirational "Carry On" and concluded with the song that put them on the map, "We Are Young."

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"We are absolutely thrilled be here tonight," Ruess told the enthusiastic audience. "It's a real honor."

Ruess told MTV News ahead of their performance that they wanted to bring a lot of emotion to their performance, and it seems as though they delivered on that goal.

"You bring a lot of emotion [to the performance]," Ruess said. "I was writing a set list for it, and three of the songs could be closely related to how we feel about Obama and the change he's been involved in making. For me, it's super, super emotional."

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Other performers at Monday evening's Inaugural Ball included Alicia Keys, the "Glee" cast, John Legend, Far East Movement, Katy Perry, Soundgarden and Usher.

MTV News is on the ground in D.C. for Inauguration Weekend bringing you the latest from the presidential events, performances and parties right through the final ball tonight. And although the election's over, you can still get involved by heading over to serve.mtv.com.