The event led with a minute's silence to pay respects to the New Zealand terror attack victims.
Kate Middleton showed her love for the Irish in a head-to-toe emerald green ensemble during her annual visit to the Irish Guards in London.
The Duchess of Cambridge dressed for the occasion in a deep green Alexander McQueen coat, velvet Gianvito Rossi heels and a hat from Lock and Co.
The Daily Mail also notes that Kate is also wearing a "special Cartier shamrock brooch, which is loaned to royal members for engagements with the Guards."
Every year since her 2011 wedding to Prince William – who is Colonel of the Irish Guards – the Duchess has adopted a different shade of green to meet the 1st Battalion at their base in Hounslow, west London.
As is tradition, Kate presented a basket of shamrocks to officers and warrant officers. Three cheers were then raised to the royal duo before a march past where William took the salute.
Leading the procession was Irish wolfhound and mascot Domnhall, whom Kate petted and stroked several times before finally presenting him with a shamrock.