Prince William left the King Edward VII hospital in London today. He was visiting Kate Middleton, who was admitted for an acute form of morning sickness called hyperemesis gravidarum. The palace confirmed Kate's pregnancy overnight after weeks of speculation. She has since cancelled multiple upcoming appearances in order to rest. Kate was out and about in recent days, though, attending St. Andrew's Day celebrations at her former school, travelling to Cambridge with William, and appearing at a reception at London's Natural History Museum.