In pictures: British royal couple attend St Patrick's Day parade

Prince William and Kate Middleton were guests of honor at the 1st Battalion Irish Guards at the St Patrick's Day Parade at Cavalry Barracks on Sunday in Hounslow, England.
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Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the 1st Battalion Irish Guards St Patrick's Day Parade at Cavalry Barracks on March 17, 2019 in Hounslow, England.
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Catherine, Duchess of Cambridge presents shamrocks to members of the 1st Battalion Irish Guards at the St Patrick's Day Parade at Cavalry Barracks on Sunday in Hounslow, England.
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Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the 1st Battalion Irish Guards St Patrick's Day Parade at Cavalry Barracks on March 17, 2019 in Hounslow, England.
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Britain's Catherine, Duchess of Cambridge, presents a shamrock to the mascot of the 1st Battalion Irish Guards, an Irish wolfhound called Domhnall, as she attends St Patrick's Day Parade at Cavalry Barracks on Sunday in Hounslow, England.
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Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the 1st Battalion Irish Guards St Patrick's Day Parade at Cavalry Barracks on March 17, 2019 in Hounslow, England.
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Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the 1st Battalion Irish Guards St Patrick's Day Parade at Cavalry Barracks on March 17, 2019 in Hounslow, England.