A Christmas concert attended by US President Barack Obama and his family included some non-traditional entertainment this year: a performance by South Korean rapper and Internet sensation PSY.

PSY - wearing an all-red outfit including a sparkling, sequined top - was backed by dancers wearing reindeer antlers as he performed his popular "Gangnam Style" dance, which mimics riding a horse.

The rapper, born Park Jae-sang, apologized last Friday for using what he called "inflammatory and inappropriate language" during anti-US protests at concerts in 2002 and 2004. But the flak from his remarks didn't dampen Sunday's holiday mood.

Other performers at the concert included Diana Ross, Demi Lovato, "American Idol" winner Scotty McCreery and Megan Hilty, star of the NBC musical drama "Smash."

Obama said the celebration was "a chance to get in the Christmas spirit, spread some joy and sing along with artists who have much better voices than we do."

He also said the season was a time to remember that everyone is "incredibly blessed in so many ways," and to share with the less fortunate, such as those in hospitals, shelters and battlefields far from home.

The "Christmas in Washington" concert at the National Building Museum benefits the Children's National Medical Center.

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