The Duke And Duchess Of Cambridge Visit the 1st Battalion Irish Guards On St Patrick's Day [Getty Images]

ALDERSHOT, ENGLAND - MARCH 17: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend a St Patrick's Day parade by the 1st Battalion Irish Guards as they visit Aldershot Barracks on St Patrick's Day on March 17, 2013 in Aldershot, England. (Photo by Toby Melville - WPA Pool/Getty Images)

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