The Duke and Duchess of Cambridge attend the Irish Guards St Patrick's Day Parade in Aldershot.
Iconic landmarks around the world have been lit up in green to celebrate St Patrick's Day on Sunday.
The 1st Battalion Irish Guard came out in full ceremonial uniform today to celebrate St Patricks Day and meet the Duchess of Cambridge.
The Duke and Duchess of Cambridge will be the guests of honour at the Irish Guards' St Patrick's Day Parade. William will attend as colonel of the regiment and Kate will present traditional sprigs of shamrock to officers and guardsmen at their base in Aldershot, Hampshire.
The royal couple will watch as the Band of the Irish Guards marches on to the parade square at Mons Barracks followed by 300 soldiers. They will be joined by Domhnall, the regiment's Irish wolfhound mascot, who will receive his own sprig of shamrock from the Duchess.
Tens of thousands of people lined the streets of London to watch the Mayor's St Patrick's Day parade. Dressed in green, and holding Irish flags, onlookers were treated to pageantry, floats and marching bands. The crowds also gathered in Trafalgar Square to see live Irish music and dancing.
St Patrick's Day festivities have begun in New York City as the parade made their way up Fifth Avenue. Both the New York Fire Department and NYPD joined in on the annual event.
Egypt's pyramids and sphinx have been illuminated in green light to mark St Patrick's Day tomorrow.
They are one of almost 70 famous landmarks around the world that are being lit up to celebrate Ireland's National Day, according to Tourism Ireland.
Other green landmarks include Sydney Opera House, the London Eye, Niagara Falls, the Leaning Tower of Pisa and Anfield Stadium in Liverpool.
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Government buildings, cathedrals and colleges have all been turned green as St Patrick's festival celebrations commence in Ireland.