William and Kate kept the news of their engagement a secret for a few weeks before deciding to share it with the world - at which point, William picked up the phone to his grandmother

Liz Hatton, a U.K. 16-year-old fighting a rare and aggressive form of cancer, was invited to spend Wednesday afternoon at Windsor Castle photographing an investiture ceremony led by Prince William. She was treated to an unforgettable afternoon, but got another surprise: A personal meeting and hug from Kate Middleton and the prince of Wales.