Britain's Prince Charles (C) and Camilla, Duchess of Cornwall (2nd R) walk behind Queen Elizabeth (FRONT 2nd L) and Prince Philip (FRONT R) as they arrive for the State Opening of Parliament, at the Palace of Westminster in London, May 8, 2013. [Photo/Agencies]

Britain's Queen Elizabeth (R) and Prince Philip (2nd R) arrive for the State Opening of Parliament, at the Palace of Westminster in London, May 8, 2013. [Photo/Agencies]