LONDON - MAY 25: U.S. President Barack Obama and Michelle Obama greet Queen Elizabeth ll ahead of a dinner at Winfield House, the official residence of the US Ambassador, on May 25, 2011 in London, England. (Photo by Anwar Hussein/WireImage)
LONDON - MAY 25: U.S. President Barack Obama and Michelle Obama greet Queen Elizabeth ll ahead of a dinner at Winfield House, the official residence of the US Ambassador, on May 25, 2011 in London, England. (Photo by Anwar Hussein/WireImage)