The name of Prince William and Kate's son was announced Wednesday by Kensington Palace, two days after he was born.
Her Royal Highness The Duchess of Cambridge was safely delivered of a son at 4.24pm.
The baby weighs 8lbs 6oz.
The Duke of Cambridge was present for the birth.
The Queen, The Duke of Edinburgh, The Prince of Wales, The Duchess of Cornwall, Prince Harry and members of both families have been informed and are delighted with the news.
Her Royal Highness and her child are both doing well and will remain in hospital overnight.
The royal bun may be ready to come out of the oven.
After spending a week at the Middleton family home in the English countryside, pregnant Kate Middleton and husband Prince William abruptly left for London around 3 p.m. on Friday, according to Us Weekly, who reported it confirmed that all royal protection officers have also departed the Middleton home.
The Duchess of Cambridge has been admitted to hospital and is in the early stages of labour, Kensington Palace has said.
She travelled by car from the palace to St Mary's in Paddington, west London, with her husband the Duke of Cambridge.
The BBC's Nick Witchell said the long wait was over but there was likely to be no more news until the official announcement of the birth.
It will be the couple's first child and will be third in line to the throne.
The world's press have been camped outside St Mary's for days in anticipation of the birth. The due date had never been officially announced but had widely been expected to be mid-July.
LONDON (AP) — Prince William's wife, Kate, is in labor in a private wing of a central London hospital, palace officials said Monday.
It is a historic moment for the British monarchy — the couple's first child will become third in line for the British throne, after Prince Charles and William, and should eventually become king or queen.
Royal officials said they traveled by car, without a police escort, just before 6 a.m. Kate — also known as the Duchess of Cambridge — is expected to give birth in the private Lindo Wing of the hospital, where Princess Diana also gave birth to William and his younger brother, Prince Harry.
"Things are progressing as normal," the couple's spokesman said.
LONDON (Reuters) - Already touted as one of the most famous babies in the world, the first child of Prince William and wife Kate faces a life in the spotlight like no previous royal, severely testing the couple's desire to give their offspring a "normal" life.
From the moment the baby boy leaves hospital in the arms of his parents in front of an army of TV cameras and photographers, his life in the public eye begins and so does his parents' formidable battle to protect his privacy.
Britain's Queen Elizabeth II arrived at Kensington Palace Wednesday to see her new great-grandson, who has spent a first night at home with his parents, Prince William and Kate, Duchess of Cambridge./ Press Association via AP Images
The 87-year-old monarch made the short trip from Buckingham Palace to meet the two-day-old Prince of Cambridge, who is third in line to the throne, and stayed for half an hour, the BBC reports. She visited without her husband, Prince Philip; he's still recovering from abdominal surgery.
At a Buckingham Palace reception on Tuesday evening, the queen said she was "thrilled" by the new arrival, according to the BBC. A guest at the event for the queen's Award for Enterprise said the monarch called the baby a "big boy" and noted that "the first born is very special."