The Princess of Wales described a visit to a ballet performance as "moving and inspiring", as she continues her recovery from cancer.
Kate attended the English National Ballet's matinee show of Giselle at Sadler's Wells Theatre in north London on Thursday.
In a message on X, she paid tribute to the company and the production, calling it "creativity at its best".
The visit comes after Kate held a meeting at Windsor Castle earlier this week to discuss her annual Christmas carol service.
That event was only the fourth time she has been mentioned in official records of royal engagements since the beginning of the year.
In March the princess confirmed that pre-cancerous cells had been found following abdominal surgery and she would have to undergo a course of preventative chemotherapy.
Earlier this month, the princess revealed that she had finished her chemotherapy course in a personal video, which featured her husband Prince William and their three children.
Kate said she was "looking forward to being back at work" and taking on "a few more public engagements" over the coming months.
The princess added that she had a "renewed sense of hope and appreciation of life" as she entered a "new phase of recovery".
While undergoing treatment, Kate attended the King's birthday parade, also known as Trooping the Colour, in June. The following month she appeared at Wimbledon.
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On Tuesday, Kate held discussions about a carol service which will be held at Westminster Abbey for the fourth year in a row and will be broadcast on TV on Christmas Eve.
The princess is expected to host the service and is likely to be joined by her husband, children and other royals.
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