Catherine, Princess of Wales, has apologized to the Irish Guards in a letter sent from Kensington Palace. “I wanted to write and let you know how proud I am of the entire Regiment ahead of the Colonel’s review and Trooping of the [Color],” Her Royal Highness shared. “I appreciate everyone trooping this year has been practicing for months and dedicating many hours to ensuring their uniforms and drill are immaculate.” “Being your colonel remains a great honor, and I am very sorry that I’m unable take the salute at this year’s Colonel’s review,” the future queen added. “Please pass my apologies t…