London:
Prince William has expressed his joy at becoming a father after his wife Kate gave birth to a bouncing baby boy at a London hospital.
"We could not be happier," said the Duke of Cambridge in reference to the new Prince of Cambridge, whose name is yet to be announced to the world.
31-year-old William is on a two-week paternity leave from his job as a Royal Air Force pilot based in Anglesey in Wales to spend time with his new-born.
He spent the night at the Lindo Wing of St Mary's Hospital in Paddington, central London, where the baby was born and is expected to pose for photographs with mother and child on the steps of the hospital later on Tuesday.
After what was labelled as the 'Great Kate Wait' is over, the media speculation is now centred around not only the name of the third in line to Britain's throne but also how he would be secured into a child seat for his journey from the hospital to home - expected to be an apartment in his great-grandmother Queen Elizabeth II's Buckingham Palace.
Meanwhile, celebrations carried on across Britain with church bells and gun salutes.
Trafalgar Square in London will be lit blue for a week and the traditional Guard of Honour at Buckingham Palace played "Congratulations" to mark the birth.