When Prince Charles first spoke to reporters he joked: "How do you know I'm not on a radio station?"
He also said how pleased he was that the Duchess of Cambridge's condition was improving, hours after she was released from the King Edward VII Hospital in central London.
He said: "I'm very glad my daughter-in-law is getting better, thank goodness."
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.