CAMBRIDGE, UNITED KINGDOM - MAY 23: Queen Elizabeth II gets off the all new Eco-friendly bus at the Cambridge Biomedical Campus on May 23, 2013 in Cambridge, England. PHOTOGRAPH BY Michael Dunlea / Barcroft Media

GREENWICH, CT - MAY 15: HRH Prince Harry competes at the 2013 Sentebale Royal Salute Polo Cup at the Greenwich Polo Club, where Land Rover is the Official Team Sponsor on May 15, 2013 in Greenwich, Connecticut. PHOTOGRAPH BY Imago / Barcroft Media

Britain's Prince Charles, President of the Royal College of Music, speaks to President's Award winner Ruairi Glasheen during the annual awards ceremony on May 15, 2013 in London, England. To mark the 20th year of his Presidency a new Presidents Award has been created sculptured from Oak from the Prince's Highgrove Estate.

Princess Letizia of Spain visits an exhibition at the Museo del Prado on May 14, 2013 in Madrid, Spain.

JERSEY SHORE, NJ - MAY 14: Prince Harry (L) and Chris Christie, the governor of New Jersey tour the Superstorm Sandy ravaged boardwalk during the fifth day of Prince Harry's visit to the United States on May 14, 2013 in New Jersey. Prince will be undertaking engagements on behalf of charities with which he is closely associated on behalf of HM Government, with a central theme of supporting injured service personnel from the UK and US forces. PHOTOGRAPH BY Unimedia / Barcroft Media

COLORADO SPRINGS, COLORADO - MAY 12: Britain's Prince Harry attends the Warrior Games Cycling Race at the United States Air Force Academy on May 12, 2013 in Colorodo springs, Colorado. PHOTOGRAPH BY Nathan W. Armes / Barcroft Media