The Duke Of Cambridge Visits The 1st Battalion Irish Guards For The St. Patrick's Day Parade [Getty Images]

LONDON, ENGLAND - MARCH 17: Prince William, Duke Of Cambridge Guardsmen with sprigs of Shamrock during the 1st Battalion Irish Guards for the St. Patrick's Day parade on March 17, 2016 in London, United Kingdom. (Photo by Heathcliff O'Malley - WPA Pool/Getty Images)

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