WASHINGTON (WUSA) - As hundreds of military kids filled the ballroom at the Walter E. Washington Convention Center on Saturday, most of them seemed to have one thing in common.

"I'm pretty excited to see Katy Perry," said Maddie Bergman, 18, as she waited for the concert to begin. "I really like her music."

Kids walked around singing and dancing her songs while they waited for the Kids' Inaugural: Our Children. Our Future" concert to begin. The event was hosted by Michelle Obama and Dr. Jill Biden as part of their initiative to Joining Forces, which supports military families and celebrates their service.

"The event really emphasizes the families and I think that's really important," Landsay Glang, 18, said whose mother works for the National Military Family Association.

America's Got Talent host Nick Cannon emceed the event with the assistance of Dancing with the Stars winner and war hero J.R. Martinez.

Pop star Usher was the first to take the stage with his club-going, body-grooving hit song "Yeah," followed by performances by Mindless Behavior, Cast members of Fox series "Glee," Far East Movement, Soul Children of Chicago joined Black Violin, Glow stick dance group iLuminate from America's Got Talent, UK heartthrobs and Katy Perry.

Michelle Obama and Dr. Jill Biden, who were both accompanied to the event by their kids, spoke on stage before the performances began.

"My favorite part of this entire weekend is being right here with all of you, the First Lady said.

Dr. Biden addressed children at the event who she visited a few weeks prior while their parents were being deployed to Afghanistan.

"I want to give a special welcome to some very brave kids from the Delaware Army National Guard 153rd military police company," Dr. Biden said. "We will be here for you while your moms and dads are away.

Before Katy Perry's anticipated performance, the First Lady gave her final remarks.

"We cannot be satisfied until we serve all of you as you have served our country," she said.

As Michelle Obama walked off stage and the music began, children got up from their seats and began clapping and screaming. Pop sensation Perry walked out in a sexy American flag bathing suit and paraded around the stage singing hits Teenage Dream, Firework, Part of Me, and Wide Awake.

Twelve-year-old Dylan Garvin walked out of the concert after it all wrapped up with a smile on his face.

"I thought it was incredible," he said. "I got to see everybody I love, especially Katy Perry."

Fifteen-year-old Sophia Ramos, whose father is on sea duty for the next two years with the NOAA, enjoyed the performances along with her 12-year-old sister and mother.

"It was awesome, Katy Perry was like 20 feet way from us," she said.

Her mother, Melissa Ramos, said it has been difficult for their family but "events like these reminds our children that our country supports them."

The energy continued all the way to the Mt. Vernon Metro Station where a 7-year-old was heard singing "I wish I knew then, what I know now" while waiting with her mother in line.

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