The Queen Hosts A Reception For Delegates Of The London Summit…LONDON – APRIL 1: The President of the United States Barack Obama (C back to camera) greets King Abdullah of Saudi Arabia (C) before the official G20 leaders photograph with Queen Elizabeth II at Buckingham Palace on April 1, 2009 in London, England. Obama is on his first trip to the UK as President and will be attending G20 world leaders’ summit dedicated to tackling the global financial crisis. (Photo by John Stillwell/WPA Pool/Getty Images)