The Princess of Wales dazzled alongside Prince William at a historic Royal Family engagement at Mons Barracks in Aldershot today.
Kate, 41, attended the event for the first time in her capacity as Colonel of the Irish Guards.
The Princess of Wales succeeded the Prince of Wales in the prestigious position.
Prince William told the Irish Guards: "I may be stepping aside, but in Colonel Catherine, you have a committed, focussed, and already incredibly loyal 11th Colonel."
The Princess of Wales succeeded the Prince of Wales in the prestigious position
PA
Whilst Kate stated she "couldn't be prouder" to stand in front of the Guards during this important day in her own speech.
The Princess of Wales added: "It really is a true honour to be your Colonel.
"I am here to listen to you, to support you, and to champion you in all you do.
"This is a responsibility I do not take lightly."
Kate and William marked St Patrick's Day on Twitter before their arrival.
PA
Kate is the 11th Colonel of the Irish Guards
PA
The Prince and Princess of Wales also met some family members of the Irish Guards.
PA
Kate and William also marked St Patrick's Day on Twitter before their arrival.
They wrote: "Wishing all our followers a very happy St Patrick’s Day today! Looking forward to joining the @irish_guards this morning to celebrate at the #StPatricksDay Parade."
The Prince and Princess of Wales also met some family members of the Irish Guards.
Kate and William met Aiofe, 6, and Alice, 4, the daughters of Warrant Officer Alistair Wigley.
