From Galway to New York, events are being held across countries with parades and parties to mark Ireland’s National Day, when revellers traditionally dress in green.
Donning a dark green coat, Kate also known as the Duchess of Cambridge, greeted a tall Irish wolfhound and mascot Domhnall while William, dressed in full military attire, took the salute during a march past.
William, the grandson of Britain’s Queen Elizabeth and second in line to the throne, is colonel of the Irish Guards, a regiment of the British army.
The couple will later meet members of the regiment and attend a lunch. Events will be held across London to celebrate the day.
(Production: Aiden Nulty)