The Duke And Duchess Of Cambridge Attend The Irish Guards St Patrick's Day Parade [Getty Images]

LONDON, ENGLAND - MARCH 17: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge stand as the 1st Battalion Irish Guardsmen leads the annual Irish Guards' St Patrick's Day Parade at Household Cavalry Barracks on March 17, 2017 in London, England. (Photo by Dan Kitwood/Getty Images)

Getty Images Entertainment Dan Kitwood