The Duchess of Cambridge gives birth to a healthy baby at 4.24pm on Monday.
Kate was admitted to hospital at around 5.30am and arrived in car with Prince William.
She planned to give birth to the royal baby naturally and she was not induced into labor.
The baby boy will be the future King and weighs 8lb 6oz.
Prince William was very proud and was by the side of the duchess when she gives birth.
It was announced by a press release sent out from the palace at 8.30pm GMT and placed on easel outside Buckingham Palace for the waiting crowds to see.
Meanwhile, Kate and her son are both doing well and will remain in hospital overnight.
The Queen and Duke of Edinburgh are delighted at news of their great grandson’s birth.
The Prime Minister and some people express their congratulations.