Prince William attended his first official public engagement since news of his wife's pregnancy broke and joked that the name of her illness should be changed.
Former Centrepoint chairman Michael O'Higgins said of the Prince: "He said they shouldn't call it morning sickness as it's a day and all night sickness."
The Duchess of Cambridge left hospital today, after three days of treatment for a severe form of morning sickness.
A nurse disclosed information about Kate's condition to two DJs who rang the hospital claiming to be the Queen and Prince Charles.
The Duchess of Cambridge is to spend another night in hospital being treated for acute morning sickness but is said to be feeling better.