The appearance of two familiar figures ignited a short-lived frenzy among journalists perched outside the Lindo Wing of St Mary's Hospital.
The regal looking pair stepped out of a blacked-out land rover and made their way to the top of the entrance of the private hospital, but the police officer at the door spotted they were not the Duke and Duchess and accompanied them back down the stairs.
The lookalikes were part of a stunt by tabloid newspaper, The Sun.
More top news
A cheap over-the-counter painkiller taken by millions of people in Britain every day could have the hidden benefit of slowing down ageing.
Some four million Brits are expected to fly out of the UK over the festive period, along with many more using roads and railways.
Scientists believe they may have found the key to fighting HIV - and it rests in the immune system of llamas.