The event is a major one on the royal calendar.
In the letter, she expressed regret for not being able to attend the rehearsal held on June 8. kindly send my very best wishes and good luck to all involved.
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The Princess of Wales signed it, Colonel Catherine.
The Prince and Princess of Wales Twitter
The Irish Guards wrote on X alongside images of the letter.
It was reposted by the Prince and Princess of Wales.
We continue to wish Her Royal Highness well in her recovery and send Her our very best wishes.
Quis Separabit @KensingtonRoyal @ArmyInLondon, the Irish Guards wrote.
