The British hospital treating Prince William's pregnant wife Catherine admitted on Wednesday that it released her private medical details to hoax callers from an Australian radio station.
Presenters from Sydney's 2Day FM station, posing as Queen Elizabeth II and William's father Prince Charles, got through to a nurse at London's private King Edward VII's Hospital, where Kate is being treated for acute morning sickness.
The hospital confirmed that a nurse discussed Kate's condition and said it "deeply regrets" the incident, which happened in the early hours of Tuesday, while the radio station has apologised.
The hoax is deeply embarrassing for the hospital, which has also treated the queen, her husband Prince Philip and Charles' wife Camilla over the years. The queen is its patron.
"This was a foolish prank call that we all deplore," said the hospital's chief executive John Lofthouse.
"We take patient confidentiality extremely seriously and we are now reviewing our telephone protocols."
Lofthouse revealed the hospital was deciding whether to take legal action.
"I've received advice that what the Australian broadcasters did may well have broken the law," he added. "On the other hand they've apologised for it so we're going to have a long and careful think about what, if anything, we do."