Kate Middleton didn't wear her engagement ring that once belonged to Princess Diana at the Royal Marsden Hospital in London on Jan. 14. Inside why and more about Princess Kate's new ring.

Princess Kate recently visited the Royal Marsden Hospital, where she had received treatment. During the visit, she expressed gratitude and emotion as she spoke with patients and praised the hospital's exceptional work.

Catherine, Princess of Wales revealed on Tuesday that she is in remission from cancer, following a visit to the London hospital where she was treated last year.

Kate Middleton visited the Royal Marsden Hospital in London on Tuesday, Jan. 14, where she received chemotherapy treatment after her cancer diagnosis last year. See all the photos here

For her first official solo appearance in over a year, Princess Kate met with cancer patients and the team at London's Royal Marsden Hospital.

The Princess of Wales wanted to “show her gratitude to the incredible team, but also highlight the world leading care and treatment the Marsden provides.”

Princess Kate Middleton opened up about the side effects of chemo when she visited the Royal Marsden Hospital in London, which is where she received treatment amid her own cancer battle. The Princess of Wales,

Kate Middleton returned to the hospital where she underwent cancer treatment earlier today, Jan. 14. The Princess of Wales visited The Royal Marsden Hospital in London, where she spoke with other patients undergoing treatment after she and her husband, Prince William, became Joint Patrons of The Royal Marsden NHS Foundation Trust.

The Princess of Wales made a surprise return to the Royal Marsden Hospital to personally thank staff who looked after her during her cancer treatment on Tuesday. At such a critical moment in US history, we need reporters on the ground. Your donation allows us to keep sending journalists to speak to both sides of the story.