U.S. television presenter Oprah Winfrey arrives for the dinner birthday party of former president of South Africa Nelson Mandela in central London's Hyde Park, Wednesday June 25, 2008. Mandela is in London for a week of events to celebrate his 90th birthday, including an outdoor concert in his honor at Hyde Park on Friday with Proceeds going to his 46664 charity. (AP Photo/Lefteris Pitarakis)