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