CBS News reports King Edward VII's Hospital in London confirmed that Kate's nurse fell for a crank call from Australian radio station 2DayFM on Tuesday.
The nurse ended up divulging information about the Duchess of Cambridge's condition to the radio hosts impersonating Queen Elizabeth II and Prince Charles.
Using poor British accents, hosts Mel Greig and "MC" called to inquire about Kate's latest health condition.
Thinking it was really Queen Elizabeth II and Prince Charles on the other line, the nurse told the radio hosts, "She's sleeping at the moment and she has had an uneventful night, she's been given some fluid to re-hydrate her...she's stable at the moment.
When asked when would be a good time to visit the former Kate Middleton, the nurse said, "I would suggest that any time after 9 o'clock will be suitable because the doctor will be in the morning. And we'll just be getting her freshened up in the morning."
The hospital released the following statement: "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 King Edward VII's 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."