Last year, Kate Middleton got a few new titles, including the Princess of Wales and the Duchess of Cornwall. But at a St. Patrick’s Day Parade in Aldershot on Friday, Prince William revealed another new name when he called her “Colonel Catherine.” In December, she took over for William as the regiment’s colonel after King Charles III named him the new Colonel of the Welsh Guards. 

In a speech at the event, William referenced the handover and his history at the event. “On this, my 13th and final St. Patrick's Day as colonel, not only am I saddened that I’ll likely fail once again to finish a pint of Guinness… but I am also sad that I won't in future see more of you, the families, whose unwavering support enables these outstanding men and women to do what they do,” he said. “I may be stepping aside, but in Colonel Catherine, you have a committed, focused, and already incredibly loyal 11th colonel.”

Kate, wearing a turquoise suit by Catherine Walker, also gave some remarks about her new duty. “I really couldn’t be prouder to stand in front of you here today. It really is a true honor 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,” she said. “I look forward to spending more time with you and your families, seeing your commitment to duty and service in all you do.”

During the event, she also wore a piece of familiar shamrock brooch that represents the royal regiment. According to jewelry expert Maxwell Stone of Steven Stone, the brooch is usually loaned to a royal woman by the Irish Guards. “Believed to have been designed by Cartier, the piece is made from 18 carat yellow gold and features a tiny, single emerald at the center of the textured leaves,” he said.  “Previously worn by the Queen Mother and Princess Anne, Kate has worn the brooch on several visits to Northern Ireland, as well as to St. Patrick’s Day celebrations.”

On March 8, Kate went on her first official engagement as the regiment’s colonel when visited a training center in Salisbury Plain. She even donned a camo suit and joined in the training in the snow. Photos of the engagement were posted to the couple’s Instagram account with a caption reading, “The work of the Irish Guards is as wide-ranging as it is exemplary, from training park rangers on counter-poaching in East Africa to de-mining training for Ukrainian Armed Forces. Fantastic to be with ‘The Micks’ today seeing their hard work (whatever the weather!)”