The Princess of Wales has apologised for missing the Colonel's Review.
The 42-year-old royal - who is undergoing preventative chemotherapy for an undisclosed form of cancer - has sent a letter to the Irish Guards, apologising for her absence from the event.
The letter read: "I wanted to write to you to let you know how proud I am of the entire regiment ahead of the Colonel's Review and Trooping the Colour.
"I appreciate everyone Trooping the Colour this year has been practising for months and dedicating many hours to ensuring their uniforms and drill are immaculate.
"Being your colonel remains an honour and I am very sorry that I'm unable to make the salute at this year's Colonel's Review. Please pass on my apologies to the whole regiment.
"I do hope that I'm able to represent you all once again very soon.
"Please send my very best wishes and good luck to all involved."
The Colonel's Review was held at Horse Guards Parade in Whitehall, London, on Saturday (08.06.24).
The ceremonial military event is a dress rehearsal for the Trooping the Colour.
Meanwhile, the Irish Guards have sent their support to the princess as she continues with her recovery.
In a post on X, the Irish Guards said: "The Irish Guards were deeply touched to receive a letter from our Colonel, Her Royal Highness, The Princess of Wales this morning.
"We continue to wish Her Royal Highness well in her recovery and send Her our very best wishes. Quis Separabit @KensingtonRoyal @ArmyInLondon (sic)"
In March, the princess announced that she was in the early stages of treatment after a cancer diagnosis.
She admitted in a video message that the diagnosis came as a "huge shock" to her.
The princess added: "I am well and getting stronger every day."
