Michelle Obama

US First Lady Michelle Obama (C) perform...US First Lady Michelle Obama (C) performs "tai chi" with students from the Chengdu No7 High School in Chengdu in China's southwest Sichuan province on March 25, 2014. Michelle Obama arrived in China on March 20 with her mother and daughters to kick off a seven-day, three-city tour where she will focus on education and cultural exchange.   AFP PHOTO / Peter PARKSPETER PARKS/AFP/Getty Images

Peter Parks/AFP

US First Lady Michelle Obama performs t’ai chi with students from the Chengdu No 7 High School in Chengdu, in China’s southwest Sichuan province. Michelle Obama arrived in China last week with her mother and daughters to start a seven-day, three-city tour where she will focus on education and cultural exchange. Read more

US First Lady Michelle Obama (C) and Peng Liyuan, wife of Chinese President Xi Jinping are escorted by officials as they visit the Forbidden City in Beijing on March 21, 2014.  Michelle Obama arrived in Beijing with her mother and daughters to kick off a seven-day, three-city tour where she will focus on education and cultural exchange.

Andy Wong/AFP

US first lady Michelle Obama and Peng Liyuan, wife of Chinese president Xi Jinping, are escorted by officials as they visit the Forbidden City in Beijing on Friday. Mrs Obama arrived in Beijing with her mother and daughters to kick off a seven-day, three-city tour where she will focus on education and cultural exchange.

U.S. first lady Obama and her daughters Sasha and Malia welcome the official White House Christmas tree at the North Portico of the White House in Washington...U.S. first lady Michelle Obama (R) and her daughters Sasha and Malia welcome the official White House Christmas tree at the North Portico of the White House in Washington November 29, 2013. The 18.5-foot Douglas Fir was grown by Chris Botek, a second generation Christmas tree farmer from Crystal Spring Tree Farm in Lehighton, Pennsylvania.    REUTERS/Jason Reed

Jason Reed/Reuters

Michelle Obama, US first lady, and her daughters Sasha and Malia welcome the official White House Christmas tree to the White House in Washington. The 18.5ft Douglas Fir was grown by Chris Botek, a second-generation Christmas tree farmer from Crystal Spring Tree Farm in Lehighton, Pennsylvania. Read more

US President Barack Obama (L) and First Lady Michelle Obama look out from the Door of No Return while touring the House of Slaves, or Maison des Esclaves, at Goree Island off the coast of Dakar on June 27, 2013. Obama and his family toured the museum at the site where African slaves were held before going through the door and being shipped off the continent as slaves

Saul Loebsaul/AFP

US president Barack Obama and First Lady Michelle Obama look out from the door of no return while touring the House of Slaves, or Maison des Esclaves, at Goree Island off the coast of Dakar on Thursday. Mr Obama and his family toured the museum at the site where African slaves were held before going through the door and being shipped off the continent as slaves. Read more

US first lady Michelle Obama visits the Holocaust Memorial together with her daughers Malia and Sasha, from left to right, in Berlin, Germany,.

Jens Meyer/AP

US first lady Michelle Obama (left) visits the Holocaust Memorial with her daughters Malia and Sasha in Berlin, Germany. US President Barack Obama and his wife are on a two-day official visit to Germany.

Michelle Obama Visits Local Washington DC School...WASHINGTON, DC - MAY 24:  U.S. first lady Michelle Obama dances with pre-kindergarten students while she visits the Savoy School May 24, 2013 in Washington, DC. The Savoy School, once one of the lowest performing schools in the District of Columbia, has shown significant signs of improvement since being designated as one of eight schools selected last year for the Turnaround Arts Initiative by the President's Committee on the Arts and the Humanities.  (Photo by Win McNamee/Getty Images)

Win McName/Getty

US First Lady Michelle Obama dances with pre-kindergarten students while she visits the Savoy School on Friday in Washington, DC. The school, once one of the lowest performing in the District of Columbia, has shown significant signs of improvement since being designated as one of eight schools selected last year for the Turnaround Arts Initiative by the President’s Committee on the Arts and the Humanities. Read more

S First Lady Michelle Obama (C) is surr...US First Lady Michelle Obama (C) is surrounded by 6th graders from Fairfax, Viginia's Willow Springs Elementary School during a surprise visit to the Decatur House in Washington, DC, May 22, 2013. The Decatur House is a National Trust for Historic Preservation Site which received a $ 1 million grant from American Express to preserve the Slave Quarters structure and fund educational programming.     AFP PHOTO/JIM  WATSONJIM WATSON/AFP/Getty Images

Jim Watson/AFP

Michelle Obama, the US first lady, meets sixth graders from Willow Springs elementary school in Fairfax, Virginia, during a surprise visit to Decatur House, a historic building in Washington, on Wednesday. Decatur House is a National Trust for Historic Preservation site, which received a $1m grant from American Express to preserve its slave quarters and fund educational programming Read more