South African President Nelson Mandela and American pop star Whitney Houston smile for photographers in Johannesburg in this Nov 10, 1994 file photo. [Photo/Agencies]

Whitney Houston attends the Pre-Grammy Gala & Salute to Industry Icons in Beverly Hills, California, in this file photo taken Feb 12, 2011. [Photo/Agencies]

Whitney Houston shows off the seven awards she won Feb 7 at the 21st American Music Awards, in this file photo taken Feb 8, 1994. [Photo/Agencies]