Prince William and pregnant Kate celebrate St Patrick's day in London

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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. Credit: (Photo by Chris Jackson/Getty Images)

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Catherine, Duchess of Cambridge attends the annual Irish Guards St Patrick's Day Parade at Cavalry Barracks on March 17, 2018 in Hounslow, England. Credit: (Photo by Chris Jackson/Getty Images)

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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. Credit: (Photo by Chris Jackson/Getty Images)

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Catherine, Duchess of Cambridge attaches a sprig of shamrock to the regimental mascot, the Irish wolfhound 'Donal' during the annual Irish Guards St Patrick's Day Parade at Cavalry Barracks on March 17, 2018 in Hounslow, England. Credit: (Photo by Chris Jackson/Getty Images)

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Soldiers of the 1st Battalion Irish Guardsmen are seen during the annual Irish Guards St Patrick's Day Parade at Cavalry Barracks on March 17, 2018 in Hounslow, England. Credit: (Photo by Chris Jackson/Getty Images)

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