LONDON, UNITED KINGDOM - MARCH 17: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge poses for a regimental photograph with soldiers of the Irish Guards during the annual St Patrick's Day Parade at Cavalry Barracks on March 17, 2017 in London, England. (Photo by Max Mumby/Indigo/Getty Images)

LONDON, UNITED KINGDOM - MARCH 17: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge poses for a regimental photograph with soldiers of the Irish Guards during the annual St Patrick's Day Parade at Cavalry Barracks on March 17, 2017 in London, England. (Photo by Max Mumby/Indigo/Getty Images)