Prince William and Kate Middleton attended the St Patrick's Day parade at Mons Barracks in Aldershot to present sprigs of shamrocks to the officers and guardsmen of the 1st Battalion Irish Guards. Middleton also decorated the regimental mascot, an Irish Wolfhound named Domnhall, with shamrocks.

This annual ceremony dates back to 1901, when Queen Alexandra – wife of the then-king, Edward VII – requested shamrocks be given to the regiment on St Patrick's Day. Ever since then, a senior female member of the Royal Family has carried on the tradition.

Middleton wore a brown Catherine Walker coat and a Lock & Co hat, with a gold shamrock brooch given to the Queen Mother by the Irish Guards.

Kate Middleton St Patricks Day Parade
Kate Middleton presents a shamrock sprig to the mascot of the 1st Battalion Irish Guards, an Irish Wolfhound called Domhnall, at the annual St Patrick's Day Parade at Mons Barracks in AldershotToby Melville/Reuters
Kate Middleton St Patricks Day Parade
The Duchess of Cambridge and her husband laugh during their visit to a St Patrick's Day Parade at Mons BarracksToby Melville/Reuters
Kate Middleton St Patricks Day Parade
Prince William salutes as the regimental mascot walks past during the St Patrick's Day Parade at Mons BarracksToby Melville/Reuters
Kate Middleton St Patricks Day Parade
The royals chat to some school girls attending the ceremonyAnthony Harvey/Getty Images
Kate Middleton St Patricks Day Parade
The Duchess wears a Catherine Walker coat and Lock & Co hatAnthony Harvey/Getty Images
Kate Middleton St Patricks Day Parade
Prince William attaches a shamrock to his hat while visiting the Irish GuardsAdrian Dennis/AFP
Kate Middleton St Patricks Day Parade
Prince William enjoys a pint of Guinness as his pregnant wife drinks some waterEddie Mulholland/Pool
Kate Middleton St Patricks Day Parade
Prince William and Kate Middleton pose for a group shot with guardsmen and the regiment's mascot, Irish wolfhound DomhnallAnthony Harvey/Getty Images
Kate Middleton St Patricks Day Parade
The Duchess of Cambridge laughs as she and her husband pose with Irish Guards at Mons BarracksEddie Mulholland/Pool