Princess Kate has teased an upcoming Royal Family appearance in a new advert.The Princess of Wales delighted fans by revealing the first advert for her carol concert, which will air on Christmas Eve.Kate, 42, voiced a teaser for her fourth “Together At Christmas” carol service in a clip this evening.She said: “Join me this Christmas Eve, for a special Carol Service to celebrate all those who have shown love, empathy and kindness in their communities this year.”Princess Kate teases upcoming Royal Family appearance in new advertGettyRoyal fans caught a glimpse of the Princess of Wales when she was joined by her family and dozens of special guests to record the concert last week.Speaking to guests at the concert, Kate movingly said that she “didn’t know” what 2024 had in store for her at last year’s Christmas carol service.Weeks after the 2023 service, Kate underwent abdominal surgery in hospital, after which doctors broke the news that they had found evidence of cancer and advised her to undergo a course of preventative chemotherapy. Now, having completed her treatment, the royal is beginning to return to public duties and held her fourth “Together At Christmas” carol service at Westminster Abbey on December 6, which will be televised by ITV on Christmas Eve.Kate was joined by her husband, the Prince of Wales, and their three children, Prince George, 11, Princess Charlotte, nine, and Prince Louis, six.It was the first time the Wales family had been seen together in public since their appearance at Trooping the Colour, the King’s birthday parade, in June. She was also accompanied by the wider Middleton family, including her mother Carole, 69, her sister Pippa, 41, and her brother James, 37.The princess, who had been “hands-on” over every aspect of the service and held regular planning meetings at Windsor, arrived on her own at 4pm to view the Abbey and oversee last-minute arrangements before walking around to greet other guests.Princess Kate wore an Alexander McQueen coat for her outingPAPrincess Kate has held the concert annually since 2021ReutersWhen singer Paloma Faith expressed sympathy for the princess, Kate replied: “I didn’t know this time last year it was going to be the year I’ve just had.”The unplanned… but I think lots of people this year have had such challenging times and many who are here today.”Kate wore an Alexander McQueen red coat, featuring a statement black bow, which she teamed with her black Ralph Lauren boots for the occasion.Both Prince George and Prince Louis wore festive red ties to match their mother’s outfit, while Princess Charlotte wore a red coat.