Molly Riley-Pool, Getty Images
Although the entertainment for the annual event was not chosen by the White House, the holiday concert saw President Obama congratulating fellow acts, including Diana Ross and host Conan O'Brien.
"Tonight is about Conan and Diana Ross and Santa and all the other talented folks on this stage," President Obama said, failing to call out PSY, as well as fellow performer Demi Lovato, by name.
"But it's also about the Americans who are spending this holiday in a hospital bed, or a shelter, or protecting our freedom on a battlefield far from home," he added at the charity event, which benefits the National Children's Medical Center.
PSY started to perform a rendition of the holiday classic, "The Christmas Song," before launching into his viral hit, "Gangnam Style."
"While it's important that we express our opinions, I deeply regret the inflammatory and inappropriate language I used to do so," PSY said in his apology over the weekend (Dec. 8) after news of his 2004 performance of a song called "Dear American" made headlines.
The song, written by Korean band N.EX.T, protested the U.S. military's presence in South Korea during the early stages of the war in Iraq and included lyrics like, "Kill those f--king Yankees who have been torturing Iraqi captives."
The "Christmas in Washington" concert will air on Dec. 21, on TNT at 8PM ET.