Conan O'Brien, left, sings to "Hark! The Herald Angels Sing" next to first lady Michelle Obama, Sasha Obama, Malia Obama, President Barack Obama and performers Jennifer Hudson, Victoria Justice, and ... more 
Conan O'Brien, left, sings to "Hark! The Herald Angels Sing" next to first lady Michelle Obama, Sasha Obama, Malia Obama, President Barack Obama and performers Jennifer Hudson, Victoria Justice, and Justin Bieber, at the annual Christmas in Washington taping at the National Building Museum in Washington, Sunday, Dec. 11, 2011. (AP Photo/Jacquelyn Martin) less 
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Associated Press | Photo By Jacquelyn Martin
Sun, Dec 11, 2011 8:15 PM EST