Mariah Carey sings before President Barack Obama at Christmas event

Slideshow posted in Entertainment News | Monday, December 13, 2010

6 of 18: From left, Malia Obama, Sasha Obama, first lady Michelle Obama, and the first lady's mother Marian Robinson greet children dressed like elves at the National Building Museum in Washington Sunday, Dec. 12, 2010. (AP Photo / Manuel Balce Ceneta)

Get more: Mariah Carey