Despite a recent controversy over anti-U.S. military lyrics sung in 2004 for which he issued an apology on Friday, the show went on for Psy. The K-pop star performed last night before guests including President Obama at the Christmas in Washington charity concert. Sharing the stage with celebrities such as host Conan O'Brien and Diana Ross, Psy performed his gargantuan hit Gangnam Style and even got a handshake from the President. The concert will air on TNT on December 21st, but take a look now at photos from Psy's typically colorful and flamboyant show: