HOUNSLOW, ENGLAND - MARCH 17: Catherine, Duchess of Cambridge attends and presents the 1st Battalion Irish Guardsmen with shamrocks during the annual Irish Guards St Patrick's Day Parade at Cavalry Barracks on March 17, 2018 in Hounslow, England. (Photo by Andrew Parsons - WPA Pool/Getty Images)
HOUNSLOW, ENGLAND - MARCH 17: Catherine, Duchess of Cambridge attends and presents the 1st Battalion Irish Guardsmen with shamrocks during the annual Irish Guards St Patrick's Day Parade at Cavalry Barracks on March 17, 2018 in Hounslow, England. (Photo by Andrew Parsons - WPA Pool/Getty Images)
HOUNSLOW, ENGLAND - MARCH 17: Prince William, Duke Of Cambridge, Colonel of the Irish Guards and Catherine, Duchess of Cambridge attend the annual Irish Guards St Patrick's Day Parade at Cavalry Barracks on March 17, 2018 in Hounslow, England. (Photo by Andrew Parsons - WPA Pool/Getty Images)
HOUNSLOW, ENGLAND - MARCH 17: Catherine, Duchess of Cambridge attends the annual Irish Guards St Patrick's Day Parade at Cavalry Barracks on March 17, 2018 in Hounslow, England. (Photo by Samir Hussein/WireImage)
HOUNSLOW, ENGLAND - MARCH 17: Catherine, Duchess of Cambridge attends the annual Irish Guards St Patrick's Day Parade at Cavalry Barracks on March 17, 2018 in Hounslow, England. (Photo by Samir Hussein/WireImage)
