Celebrities , who gather in London to celebrate King 's 90th birthday . Mandela at outdoor concerts in his honour in London 's Hyde Park . Crowd of 46,664 . ` ` Happy Birthday '' written by Will Smith . Artists include Amy Winehouse , Queen , Annie Lennox , Simple Minds .
Celebrities , statesmen gather in London to celebrate Mandela 's 90th birthday . Mandela at outdoor concert in his honor in London 's Hyde Park . Crowd of 46,664 sing `` Happy Birthday '' led by Will Smith . Performers include Amy Winehouse , Queen , Annie Lennox , Simple Minds .