Madonna: Sticky & Sweet

U.S. singer Madonna performs on stage during her 'Sticky and Sweet' tour at the Danube Island in Vienna on Tuesday, September 23, 2008. (Reuters/Leonhard Foeger)

U.S. singer Madonna performs on stage during her 'Sticky and Sweet' tour at the Danube island in Vienna on Tuesday, September 23, 2008. (Reuters/Leonhard Foeger)

U.S. singer Madonna performs on stage during her 'Sticky and Sweet' tour at the Danube island in Vienna on Tuesday, September 23, 2008. (Reuters/Leonhard Foeger)

U.S. singer Madonna performs on stage during her 'Sticky and Sweet' tour at the Danube island in Vienna on Tuesday, September 23, 2008. (Reuters/Leonhard Foeger)

U.S. singer Madonna performs on the opening night of her 'Sticky & Sweet' tour at the Millennium Stadium in Cardiff. (Reuters/Luke MacGregor)

American singer Madonna performs onstage at the Cardiff Millennium Stadium on August 23, 2008 during the first concert of her 'Sticky and Sweet' world tour. (AFP Photo/Leon Neal)

American singer Madonna performs onstage at the Cardiff Millennium Stadium on August 23, 2008 during the first concert of her 'Sticky and Sweet' world tour. (AFP Photo/Leon Neal)

Madonna performs on stage at the premiere of her 'Sticky and Sweet' tour at Cardiff's Millennium Stadium in Wales on August 23, 2008. (AP Photo/Joel Ryan)

Madonna performs on stage at the premier of her 'Sticky and Sweet' tour at Cardiff's Millennium Stadium in Wales on August 23, 2008. (AP Photo/Joel Ryan)

American singer Madonna performs onstage at the Cardiff Millennium Stadium on August 23, 2008 during the first concert of her 'Sticky and Sweet' world tour. (AFP Photo/Leon Neal)

U.S. singer Madonna performs on the opening night of her 'Sticky & Sweet' tour at the Millennium Stadium in Cardiff August 23, 2008. (Reuters/Luke MacGregor)

American singer Madonna performs onstage at the Cardiff Millennium Stadium on August 23, 2008 during the first concert of her 'Sticky and Sweet' world tour. (AFP Photo/Leon Neal)