POSTED: Sunday, July 18, 2010 - 5:22pm
UPDATED: Sunday, July 18, 2010 - 5:25pm
The former South African president and Nobel Peace Prize winner is celebrating his birthday with family and friends at his home in Johannesburg.
His grandchildren and great-grandchildren sang him 'Happy Birthday' as they were donned "Nelson Mandela Day" T-shirts, marking the first United Nations' Nelson Mandela International Day.'
Mandela and his third wife are also celebrating their twelfth wedding anniversary.