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 honoring military families.

"Now, inauguration is a pretty big deal," First Lady Michelle Obama, who hosted the event along with Jill Biden, told the assembled families at the Washington Convention Center. "But I have to tell you that my very favorite part of this entire weekend is being right here with all of you." She paid tribute to the sacrifices that military families make, including their kids.

This was the second such concert for the Obama girls, and the choice of talent seemed to reflect the fact that they are four years older. While in 2009 they were entertained by Miley Cyrus and the Jonas Brothers, this time it was Usher and Perry, along with the groups Mindless Behavior and Far East Movement. Also performing were cast members from the Fox TV hit "Glee."

Nick Cannon emceed, but it was Michelle Obama who got to introduce the top attraction: "It is now my pleasure to introduce the fabulous Katy Perry!"

Kwan marries senator's grandson

Olympic medalist figure skater Michelle Kwan and Clay Pell, a grandson of the late Sen. Claiborne Pell, have married in Rhode Island. Kwan and Pell were wed at the First Unitarian Church in Providence. About 250 guests attended, including Gov. Lincoln Chafee and his wife, Stephanie. Pell, a lawyer and Coast Guard lieutenant, works on the national security staff at the White House. Kwan is a public policy envoy with the State Department and is the most decorated figure skater in U.S. history. She won 43 championships, the silver medal at the 1998 Winter Olympics and bronze at the 2002 Games.

WALTERS HOSPITALIZED: ABC newswoman Barbara Walters fell Saturday night at an inauguration party at an ambassador's home in Washington and was hospitalized. The 83-year-old journalist fell on a step at the residence of Britain's ambassador to the United States, Peter Westmacott, an ABC News spokesman said. The fall left Walters with a cut on her forehead. Out of an abundance of caution, she went to a hospital for treatment of the cut and for a full examination.

NOTED: Jimmy O'Neill, an Oklahoman barely out of his teens when he became Los Angeles' top-rated radio deejay and only 24 when he catapulted to national celebrity as the host of "Shindig!," one of the earliest rock 'n' roll shows on prime-time TV, died Friday at his home in West Hollywood, Calif. He was 73.