LONDON, UNITED KINGDOM - MARCH 17: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge (in his role as Colonel of the Irish Guards) attend the annual Irish Guards St Patrick's Day Parade at Cavalry Barracks on March 17, 2017 in London, England. (Photo by Max Mumby/Indigo/Getty Images)