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ALDERSHOT, UNITED KINGDOM - MARCH 17: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the annual St Patrick's Day Parade at Mons Barracks on March 17, 2015 in Aldershot, England. (Photo by Max Mumby/Indigo/Getty Images)

ALDERSHOT, UNITED KINGDOM - MARCH 17: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the annual St Patrick's Day Parade at Mons Barracks on March 17, 2015 in Aldershot, England. (Photo by Max Mumby/Indigo/Getty Images)