The First Lady Michelle Obama with her two daughters (L) greet Vice President Joe Biden's families (R) during the "Joining Forces" Kids Inaugural concert for children and military families, one of the events ahead of the second-term inauguration of US President Barack Obama, at the Washington Convention Center, US, on January 19, 2013. (Xinhua/Fang Zhe)
Singer Katy Perry (C) performs during the "Joining Forces" Kids Inaugural concert for children and military families, one of the events ahead of the second-term inauguration of U.S. President Barack Obama, at the Washington Convention Center, US, on January 19, 2013. (Xinhua/Fang Zhe)
Singer Katy Perry performs during the "Joining Forces" Kids Inaugural concert for children and military families, one of the events ahead of the second-term inauguration of U.S. President Barack Obama, at the Washington Convention Center, US, on January 19, 2013. (Xinhua/Fang Zhe)
The cartoon doll of U.S. Presidents perform during the "Joining Forces" Kids Inaugural concert for children and military families, one of the events ahead of the second-term inauguration of US President Barack Obama, at the Washington Convention Center, US, on January 19, 2013. (Xinhua/Fang Zhe)
The First Lady Michelle Obama (R) speaks at the "Joining Forces" Kids Inaugural concert for children and military families, one of the events ahead of the second-term inauguration of U.S. President Barack Obama, at the Washington Convention Center, US, on January 19, 2013. (Xinhua/Fang Zhe)
Singer Usher performs during the "Joining Forces" Kids Inaugural concert for children and military families, one of the events ahead of the second-term inauguration of US President Barack Obama, at the Washington Convention Center, US, on January 19, 2013. (Xinhua/Fang Zhe)
The First Lady Michelle Obama (C) with her two daughters arrive at the "Joining Forces" Kids Inaugural concert for children and military families, one of the events ahead of the second-term inauguration of US President Barack Obama, at the Washington Convention Center, US, on January 19, 2013. (Xinhua/Fang Zhe)