U.S. singer Madonna smiles to kids during a visit to the Morro Dona Marta slum in Rio de Janeiro November 13, 2009. The 51-year-old star is in Rio to visit some of the Brazilian city's slums, or 'favelas', said state Governor Sergio Cabral. REUTERS/Carlos Magno/Handout (BRAZIL ENTERTAINMENT) FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS