Kate Middleton has shared a sneak peek at some of her holiday plans with a social media post, announcing her ongoing Christmas concert tradition.

Kate Middleton looked “pretty healthy” and “seemed happy” to return to public life for two back-to-back appearances over the weekend, royal biographer Sally Bedell Smith tells PEOPLE.

Kate, the Princess of Wales, appeared alongside the Royal Family as they appeared at a Remembrance Day event in London on Saturday, marking the latest public engagement for Kate since completing chemotherapy earlier this year.