Her Royal Highness The Duchess of Cambridge has been admitted to St. Mary’s Hospital, Paddington, London in the early stages of labour.— Clarence House (@ClarenceHouse) July 22, 2013
The Duchess travelled by car from Kensington Palace to the Lindo Wing at St. Mary’s Hospital with The Duke of Cambridge.— Clarence House (@ClarenceHouse) July 22, 2013
Witnesses saw royal vehicles at a hospital back entrance at about 6 a.m. local time Monday.
The Daily Mail has a live feed from the front entrance to the Lindo Wing, where a royal aide is expected make the birth announcement.
UPDATE: 5:51 a.m. E.T.
CNN's Max Foster has David Cameron's first comment on the news of Kate's labor.
"Best wishes, everybody hoping for the best," Cameron said.
UPDATE: 5:21 a.m. E.T.
Kim Hjelmgaard, of USA Today, says activity outside the Lindo Wing has "shifted up a gear," as reporters and royal watchers rush to cover the news. St. Mary's security presence has also increased:
Royal watchers have been camped outside St. Mary's hospital for weeks in anticipation of Middleton's arrival. With temperatures soaring into the upper 80s, many wondered whether the duchess had chosen to give birth outside London, perhaps near her parents home in Bucklebury, until the royal couple returned to the capital city's Kensington Palace.
The Sun said Monday that Marcus Setchell, Queen Elizabeth's former gynecologist, will lead Kate's medical team. The queen's current gynecologist, Alan Farthing, will assist him.
After a royal aide receives news of the birth at the Lindo Wing's entrance, he or she will head to Buckingham Palace, where the official birth announcement will appear on an easel outside the palace gates.
Boy or girl, the little royal will be Britain's third in line to the throne.