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