US pop star Madonna performs on stage during a concert part of her 'Sticky and Sweet' tour, at the Morumbi stadium, in Sao Paulo, Brazil, on December 18, 2008. AFP PHOTO/Mauricio LIMA (Photo credit should read MAURICIO LIMA/AFP via Getty Images)
US pop star Madonna performs on stage during a concert part of her 'Sticky and Sweet' tour, at the Morumbi stadium, in Sao Paulo, Brazil, on December 18, 2008. AFP PHOTO/Mauricio LIMA (Photo credit should read MAURICIO LIMA/AFP via Getty Images)