First lady Michelle Obama, center, and daughters Sasha, left, and Malia, right, react during the Kids' Inaugural: Our Children. Our Future." event in Washington, Saturday, Jan. 19, 2013, as part of the 57th Inauguration weekend of events. (AP Photo/Frank Franklin II)
Katy Perry performs during the Kids' Inaugural: Our Children. Our Future." event in Washington, Saturday, Jan. 19, 2013, as part of the 57th Inauguration weekend of events. (AP Photo/Frank Franklin II)
Katy Perry performs during the Kids' Inaugural: Our Children. Our Future." event in Washington, Saturday, Jan. 19, 2013, as part of the 57th Inauguration weekend of events. (AP Photo/Frank Franklin II)
First lady Michelle Obama, center, and daughters Sasha, left, and Malia, right, walk on stage during the Kids' Inaugural: Our Children. Our Future." event in Washington, Saturday, Jan. 19, 2013, as part of the 57th Inauguration weekend of events. (AP Photo/Frank Franklin II)
Katy Perry performs during the Kids' Inaugural: Our Children. Our Future." event in Washington, Saturday, Jan. 19, 2013, as part of the 57th Inauguration weekend of events. (AP Photo/Frank Franklin II)
WASHINGTON — Usher sang “Yeah!” Katy Perry donned star and stripes for “Firework.” And a ballroom full of lucky kids got to rock out with Sasha and Malia Obama at Saturday’s Kids’ Inaugural Concert, a star-studded event that honors America’s military families. “Now, inauguration is …