US-POLITICS-INAUGURATION-KIDS 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. AFP PHOTO/Brendan SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)

Children Gather For Kid's Inaugural Concert

WASHINGTON, DC - JANUARY 19: The musician Katy Perry sings during the children's concert at the Washington Convention Center to celebrate military families on January 19, 2013 in Washington, DC. The U.S. capital is preparing for the second inauguration of U.S. President Barack Obama, which will take place on January 21. (Photo by Joe Raedle/Getty Images)

Children Gather For Kid's Inaugural Concert

WASHINGTON, DC - JANUARY 19: The musician Katy Perry sings during the children's concert at the Washington Convention Center to celebrate military families on January 19, 2013 in Washington, DC. The U.S. capital is preparing for the second inauguration of U.S. President Barack Obama, which will take place on January 21. (Photo by Joe Raedle/Getty Images)

Children Gather For Kid's Inaugural Concert

WASHINGTON, DC - JANUARY 19: The musician Katy Perry sings during the children's concert at the Washington Convention Center to celebrate military families on January 19, 2013 in Washington, DC. The U.S. capital is preparing for the second inauguration of U.S. President Barack Obama, which will take place on January 21. (Photo by Joe Raedle/Getty Images)

Children Gather For Kid's Inaugural Concert

WASHINGTON, DC - JANUARY 19: The musician Katy Perry sings during the children's concert at the Washington Convention Center to celebrate military families on January 19, 2013 in Washington, DC. The U.S. capital is preparing for the second inauguration of U.S. President Barack Obama, which will take place on January 21. (Photo by Joe Raedle/Getty Images)

Children Gather For Kid's Inaugural Concert

WASHINGTON, DC - JANUARY 19: The musician Katy Perry sings during the children's concert at the Washington Convention Center to celebrate military families on January 19, 2013 in Washington, DC. The U.S. capital is preparing for the second inauguration of U.S. President Barack Obama, which will take place on January 21. (Photo by Joe Raedle/Getty Images)

US-POLITICS-INAUGURATION-KIDS 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. AFP PHOTO/Brendan SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)

US-POLITICS-INAUGURATION-KIDS 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. AFP PHOTO/Brendan SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)

US-POLITICS-INAUGURATION-KIDS 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. AFP PHOTO/Brendan SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)

Children Gather For Kid's Inaugural Concert

WASHINGTON, DC - JANUARY 19: The musician Katy Perry sings during the children's concert at the Washington Convention Center to celebrate military families on January 19, 2013 in Washington, DC. The U.S. capital is preparing for the second inauguration of U.S. President Barack Obama, which will take place on January 21. (Photo by Joe Raedle/Getty Images)

Children Gather For Kid's Inaugural Concert

WASHINGTON, DC - JANUARY 19: The musician Katy Perry sings during the children's concert at the Washington Convention Center to celebrate military families on January 19, 2013 in Washington, DC. The U.S. capital is preparing for the second inauguration of U.S. President Barack Obama, which will take place on January 21. (Photo by Joe Raedle/Getty Images)

Children Gather For Kid's Inaugural Concert

WASHINGTON, DC - JANUARY 19: The musician Katy Perry sings during the children's concert at the Washington Convention Center to celebrate military families on January 19, 2013 in Washington, DC. The U.S. capital is preparing for the second inauguration of U.S. President Barack Obama, which will take place on January 21. (Photo by Joe Raedle/Getty Images)

Children Gather For Kid's Inaugural Concert

WASHINGTON, DC - JANUARY 19: The musician Katy Perry sings during the children's concert at the Washington Convention Center to celebrate military families on January 19, 2013 in Washington, DC. The U.S. capital is preparing for the second inauguration of U.S. President Barack Obama, which will take place on January 21. (Photo by Joe Raedle/Getty Images)