Nelson Mandela

Former South African president and Nobel Peace Prize winner Nelson Mandela and his wife, Graca Machel, share a laugh behind his birthday cake, a gift from the staff in honor of his 90th birthday at the Nelson Mandela Foundation on Aug. 5, 2008, in Houghton, South Africa. Graca Machel is Mandela's third wife; his two previous marriages ended in divorce.

Credit: Juda Ngwenya/Nelson Mandela Foundation via Getty Images