Kate Middleton made an emotional visit Tuesday to the Royal Marsden Hospital in London, where she was treated for cancer last year. She also announced that she and her husband will become joint patrons of the prominent cancer research hospital. A source said that Kate wanted to visit the hospital to show her “gratitude” to its staff for their “exceptional care, support and compassion” and to offer support to those currently going through treatment. Kate met with staff and patients during the visit. Kate’s visit was not pre-announced.