The Duke of Cambridge has returned to his wife's hospital bedside as it emerged that prank callers tricked a nurse into revealing information about her condition.
Australian radio DJs impersonating the Queen and Prince of Wales were given an update about Kate, who was admitted to London's King Edward VII Hospital on Monday with severe morning sickness.
William, dressed casually in beige cords and a blue sweater, arrived at the private hospital in central London at 12.15pm without acknowledging the world's media camped outside the building. The Duke is likely to be angered by the intrusion into his wife's health, despite the call having a humorous rather than sinister motive.
The 2Day FM presenters were put through to a nurse who reportedly told them: "She's sleeping at the moment and she has had an uneventful night. She's been given some fluids, she's stable at the moment."
The prank call will be deeply embarrassing for the Edward VII Hospital, which is the medical institution of choice for the Royal Family. The Queen, Duke of Edinburgh and Duchess of Cornwall have all been treated at the institution over the years.
A spokesman for the hospital said: "King Edward VII's Hospital Sister Agnes can confirm that an Australian radio station made a hoax call to the hospital in the early hours of Tuesday morning. This call was transferred through to a ward and a short conversation was held with one of the nursing staff. King Edward VII's Hospital deeply regrets this incident."
John Lofthouse, chief executive at the King Edward VII Hospital, said: "This was a foolish prank call that we all deplore. We take patient confidentiality extremely seriously and we are now reviewing our telephone protocols."
The radio presenters, Mel Greig and Michael Christian, and their radio station later apologised.
Kate has been visited by her younger siblings Pippa and James Middleton who spent just over an hour with their sister. It was also reported that the Duchess' parents Carole and Michael Middleton saw their daughter on Tuesday but were unseen as they used a rear entrance.
William left shortly after 5pm having spent five hours at his wife's bedside. St James's Palace has said there is "no further update" to the statement they released last night which said the Duchess "is continuing to feel better".