Children Gather For Kid's Inaugural Concert

January 19, 2013 in Washington, DC. (Credit: Joe Raedle/Getty Images)

Children Gather For Kid's Inaugural Concert

January 19, 2013 in Washington, DC. (Credit: Joe Raedle/Getty Images)

Children Gather For Kid's Inaugural Concert

US first lady Michelle Obama (2R) cheers with her daughters Malia Obama (2L) and Sasha Obama (C) during the Kids' Inaugural concert at the Washington Convention Center January 19, 2013 in Washington, DC. The event, attended by US First Lady Michelle Obama, Sasha Obama, Malia Obama and Dr. Jill Biden, was held prior to the official swearing in of US President Barack Obama and Vice President Joe Biden is scheduled for January 20, 2013, with a ceremonial swearing in on January 21. (Credit: BRENDAN SMIALOWSKI/AFP/Getty Images)

Children Gather For Kid's Inaugural Concert

Usher performs during the Kids' Inaugural concert at the Washington Convention Center January 19, 2013 in Washington, DC. The event, attended by US First Lady Michelle Obama, Sasha Obama, Malia Obama and Dr. Jill Biden, was held prior to the official swearing in of US President Barack Obama and Vice President Joe Biden is scheduled for January 20, 2013, with a ceremonial swearing in on January 21. (Credit: BRENDAN SMIALOWSKI/AFP/Getty Images)

Children Gather For Kid's Inaugural Concert

Usher performs during the Kids' Inaugural concert at the Washington Convention Center January 19, 2013 in Washington, DC. The event, attended by US First Lady Michelle Obama, Sasha Obama, Malia Obama and Dr. Jill Biden, was held prior to the official swearing in of US President Barack Obama and Vice President Joe Biden is scheduled for January 20, 2013, with a ceremonial swearing in on January 21. (Credit: BRENDAN SMIALOWSKI/AFP/Getty Images)

Children Gather For Kid's Inaugural Concert

January 19, 2013 in Washington, DC. (Credit: Joe Raedle/Getty Images)

Children Gather For Kid's Inaugural Concert

January 19, 2013 in Washington, DC. (Credit: Joe Raedle/Getty Images)

Children Gather For Kid's Inaugural Concert

January 19, 2013 in Washington, DC. (Credit: Joe Raedle/Getty Images)

Children Gather For Kid's Inaugural Concert

January 19, 2013 in Washington, DC. (Credit: Joe Raedle/Getty Images)

Children Gather For Kid's Inaugural Concert

Singer Katy Perry performs during the Kids' Inaugural concert at the Washington Convention Center January 19, 2013 in Washington, DC. The event, attended by US First Lady Michelle Obama, Sasha Obama, Malia Obama and Dr. Jill Biden, was held prior to the official swearing in of US President Barack Obama and Vice President Joe Biden is scheduled for January 20, 2013, with a ceremonial swearing in on January 21. (Credit: BRENDAN SMIALOWSKI/AFP/Getty Images)

Children Gather For Kid's Inaugural Concert

Singer Katy Perry performs during the Kids' Inaugural concert at the Washington Convention Center January 19, 2013 in Washington, DC. The event, attended by US First Lady Michelle Obama, Sasha Obama, Malia Obama and Dr. Jill Biden, was held prior to the official swearing in of US President Barack Obama and Vice President Joe Biden is scheduled for January 20, 2013, with a ceremonial swearing in on January 21. (Credit: BRENDAN SMIALOWSKI/AFP/Getty Images)

Children Gather For Kid's Inaugural Concert

January 19, 2013 in Washington, DC. (Credit: Joe Raedle/Getty Images)

Children Gather For Kid's Inaugural Concert

January 19, 2013 in Washington, DC. (Credit: Joe Raedle/Getty Images)

Children Gather For Kid's Inaugural Concert

January 19, 2013 in Washington, DC. (Credit: Joe Raedle/Getty Images)