US President Barack Obama (R), First lady Michelle Obama (L) and their daughters Malia (2-R) and Sasha (2-L) join in for a final song at the conclusion of the performances at the annual 'Christmas in Washington' gala, in Washington, DC, USA, 11 December 2011. EPA/MIKE THEILER/POOL
US President Barack Obama (4-R), First lady Michelle Obama (C), their daughters Malia (5-R) and Sasha (6-R, partial hidden) are joined by entertainers (L-R) The Band Perry, Conan O'Brien, Jennifer Hudson, Victoria Justice and Justin Bieber for a final song at the conclusion of the performances at the annual 'Christmas in Washington' gala, in Washington, DC, USA, 11 December 2011. EPA/MIKE THEILER/POOL
US President Barack Obama (4-L), First lady Michelle Obama (L), their daughters Malia (2-L) and Sasha (2-L) are joined by entertainers Jennifer Hudson (3-R), Victoria Justice (2-R) and Justin Bieber (R) for a final song at the conclusion of the performances at the annual 'Christmas in Washington' gala, in Washington, DC, USA, 11 December 2011. EPA/MIKE THEILER/POOL
US President Barack Obama (C), First lady Michelle Obama (front row, 2-L), their daughters Malia (4-L) and Sasha (3-L) are joined by entertainers (L-R) Conan O'Brien, Jennifer Hudson, Victoria Justice and Justin Bieber for a final song at the conclusion of the performances at the annual 'Christmas in Washington' gala, in Washington, DC, USA, 11 December 2011. EPA/MIKE THEILER/POOL
US President Barack Obama (front row, 7-R), First lady Michelle Obama (5-R), their daughters Malia (6-R) and Sasha (4-R) allong with other join the audience in the playing of the national anthem prior to watching performances at the annual 'Christmas in Washington' gala, in Washington, DC, USA, 11 December 2011. EPA/MIKE THEILER/POOL
US President Barack Obama (2-R), First lady Michelle Obama (3-R) and their daughters Malia (R) and Sasha (4-R) greet children dressed as elves (foreground) prior to attending performances at the annual 'Christmas in Washington' gala, in Washington, DC, USA, 11 December 2011. EPA/MIKE THEILER/POOL
US President Barack Obama (2-R), First lady Michelle Obama (C) and daughters Malia (R) and Sasha (L) greet children dressed as elves prior to attending performances at the annual 'Christmas in Washington' gala, in Washington, DC, USA, 11 December 2011. EPA/MIKE THEILER/POOL
US President Barack Obama (2-R), First lady Michelle Obama (3-R) and daughters Malia (R) and Sasha (4-R) greet children dressed as elves prior to attending performances at the annual 'Christmas in Washington' gala, in Washington, DC, USA, 11 December 2011. EPA/MIKE THEILER/POOL
US President Barack Obama (2-R), First lady Michelle Obama (C) and daughters Malia (R) and Sasha (L) greet children dressed as elves prior to attending performances at the annual 'Christmas in Washington' gala, in Washington, DC, USA, 11 December 2011. EPA/MIKE THEILER/POOL
US President Barack Obama (R), First lady Michelle Obama (2-R) and their daughter Sasha (L) greet children dressed as elves prior to attending performances at the annual 'Christmas in Washington' gala, in Washington, DC, USA, 11 December 2011. EPA/MIKE THEILER/POOL
