ALDERSHOT, ENGLAND - MARCH 17: HRH Prince William and Catherine, Duchess of Cambridge attend the St Patrick's Day Parade at Mons Barracks on March 17, 2015 in Aldershot, England. (Photo by Anthony Harvey/Getty Images)
ALDERSHOT, ENGLAND - MARCH 17: HRH Prince William and Catherine, Duchess of Cambridge attend the St Patrick's Day Parade at Mons Barracks on March 17, 2015 in Aldershot, England. (Photo by Anthony Harvey/Getty Images)