Malia (C) and Sasha (C) Obama, daughters of US President Barack Obama, greet their mother, First Lady Michelle Obama, after getting out of the motorcade upon arrival for a reception hosted by Brazilian President Dilma Rousseff at the Palacio do Alvorada, the official residence in Brasilia, Brazil, March 19, 2011. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)