Christmas in Washington 2011

From left, first lady Michelle Obama, Sasha Obama, Malia Obama and President Barack Obama, sing "Hark! The Herald Angels Sing" with performers Jennifer Hudson, Victoria Justice, and Justin Bieber, at the annual "Christmas in Washington" taping at the National Building Museum in Washington, D.C., on Dec. 11, 2011.

Cee Lo Green sings during a taping of "Christmas in Washington," at the National Building Museum in Washington, D.C., on Dec. 11, 2011. The show, hosted by Conan O'Brien and attended by President Barack Obama, first lady Michelle Obama and their family, featured performances and appearances by Justin Bieber, Cee Lo Green, Jennifer Hudson, Victoria Justice and The Band Perry. It will air Dec. 16, 2011 on TNT.

President Barack Obama, first lady Michelle Obama and their daughter, Malia, greet children dressed as elves prior to the taping of "Christmas in Washington," at the National Building Museum in Washington, D.C., on Dec. 11, 2011.

Justin Bieber sings during a taping of "Christmas in Washington," at the National Building Museum in Washington, D.C., on Dec. 11, 2011. It marks the 30th anniversary of the gala.

President Barack Obama and first lady Michelle Obama attend the taping of "Christmas in Washington," at the National Building Museum in Washington, D.C., on Dec. 11, 2011.

President Barack Obama, first lady Michelle Obama and daughters Sasha and Malia are joined by entertainers Jennifer Hudson, Victoria Justice and Justin Bieber for a final song at the conclusion of the performances at the annual "Christmas in Washington" gala on Dec. 11, 2011, in Washington, D.C. It's the 30th anniversary of the "Christmas in Washington" gala.

Comedian Conan O'Brien speaks during a taping of "Christmas in Washington," at the National Building Museum in Washington, D.C., on Dec. 11, 2011. The show, hosted by O'Brien, was attended by President Barack Obama, first lady Michelle Obama and their family.

Justin Bieber sings during a taping of "Christmas in Washington," at the National Building Museum in Washington, D.C., on Dec. 11, 2011.

Victoria Justice sings during a taping of "Christmas in Washington," at the National Building Museum in Washington, D.C., on Dec. 11, 2011.

President Barack Obama speaks alongside first lady Michelle Obama and their daughters, Sasha and Malia, during the taping of "Christmas in Washington," at the National Building Museum in Washington, D.C., on Dec. 11, 2011.

President Barack Obama, first lady Michelle Obama and their daughters, Sasha and Malia, along with Michelle Obama's mother, Marian Robinson, attend the taping of "Christmas in Washington," at the National Building Museum in Washington, D.C., on Dec. 11, 2011.

Victoria Justice and Justin Bieber perform at the taping of the annual "Christmas in Washington" presentation at the National Building Museum in Washington, D.C., on Dec. 11, 2011.

Victoria Justice sings during a taping of "Christmas in Washington," at the National Building Museum in Washington, D.C., on Dec. 11, 2011.

President Barack Obama, first lady Michelle Obama, and daughters Malia and Sasha pose for a group photo with children dressed as elves prior to attending performances at the annual "Christmas in Washington" gala on Dec. 11, 2011 in Washington, D.C.

From left, The Band Perry, Conan O'Brien, first lady Michelle Obama and daughters Malia and Sasha, President Barack Obama, Jennifer Hudson, Victoria Justice and Justin Bieber join together for a final song at the conclusion of the performances at the annual "Christmas in Washington" gala on Dec. 11, 2011 in Washington, D.C. It's the 30th anniversary of the "Christmas in Washington" gala.