HOUNSLOW, ENGLAND - MARCH 17: Prince William, Duke Of Cambridge, Colonel of the Irish Guards and Catherine, Duchess of Cambridge pose for a photo as they 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 and Prince William, Duke Of Cambridge attend the annual Irish Guards St Patrick's Day Parade at Cavalry Barracks on March 17, 2018 in Hounslow, England. (Photo by UK Press Pool/UK Press via Getty Images)
HOUNSLOW, ENGLAND - MARCH 17: Catherine, Duchess of Cambridge and Prince William, Duke Of Cambridge attend the annual Irish Guards St Patrick's Day Parade at Cavalry Barracks on March 17, 2018 in Hounslow, England. (Photo by UK Press Pool/UK Press via 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 UK Press Pool/UK Press via 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 UK Press Pool/UK Press via Getty Images)
