The Spice Girls perform during the closing ceremony of the 2012 Summer Games. (Gabriel Bouys / AFP/Getty Images)
U.S. athletes watch George Michael perform during the closing ceremony of the 2012 London Olympics. (Wally Skalij / Los Angeles Times)
The Who performs during the closing ceremony of the London 2012 Olympic Games. (Christophe Karaba / EPA)
British group One Direction perform during the closing ceremony of the London 2012 Olympic Games. (Christophe Karaba / EPA)
Closing ceremony of the 2012 London Summer Games (Francke Fife / AFP/Getty Images)
Athletes fill the Olympic stadium during the closing ceremony. (Damien Meyer / AFP/Getty Images)
Flagbearers parade during the closing ceremony of the 2012 London Olympic Games. (Gabriel Bouys / AFP/Getty Images)
Closing ceremony of the 2012 London Summer Games (Hannibal / EPA)
Closing ceremony of the 2012 London Summer Games (Adrian Dennis / AFP/Getty Images)
Closing ceremony of the 2012 London Summer Games (Nic Bothma / EPA)
Closing ceremony of the 2012 London Summer Games (Robert Gauthier / Los Angeles Times)
Closing ceremony of the 2012 London Summer Games (Christophe Karaba / EPA)
Closing ceremony of the 2012 London Summer Games (Clive Brunskill / Getty Images)
Closing ceremony of the 2012 London Summer Games (Saeed Khan / AFP/Getty Images)
The sun sets over Olympic Park as the closing ceremony of the London 2012 Olympic Games commences. (Facundo Arrizabalaga / EPA)
Closing ceremony of the 2012 London Summer Games (Rob Carr / Getty Images)
Closing ceremony of the 2012 London Summer Games (Martin Meissner / Associated Press)
Closing ceremony of the 2012 London Summer Games (Jae C. Hong / Associated Press)
The Olympic flag is transferred from London to Rio de Janeiro, host city of the 2106 Summer Games. (Jeff J. Mitchell / Getty Images)
