The Duchess Of Cambridge arrived at the private Lindo Wing at St Mary's Hospital in Paddington on Monday morning (22 July) alongside her husband Prince William.
Kate's rumoured due date was 13 July and the nation has been waiting with baited breath for news of the royal tot ever since.
A palace spokesman said this morning the Duchess travelled by car from her London home to the hospital accompanied by Prince William and was admitted to hospital just before 6am "in the early stages of labour".
An updated statement said "things are progressing as normal".
Since then, there has been no word from the palace, and no further statement is expected until the official birth announcement.
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
We'll learn of the royal baby's birth when a statement is issued by the palace.
Just after 8pm this evening the palace revealed it was changing plans on how the birth will be announced. Originally we weren't going to learn of the arrival until a royal aide took the birth notice from the hospital to Buckingham Palace, where it would be displayed on the forecourt, but now we'll learn of the third-in-line to the throne's arrival via a statement.
No reason for the change in plans was given but some commentators suggested it was to minimise the risk of a leak.
The easel announcement will still happen after the press release, but there is some speculation that if the baby is born late this evening, the palace may choose to wait until tomorrow morning before making the easel announcement.
The Queen, Prime Minister, senior members of the royal family and the Middleton family will be told before the public announcement.
Media has been camping outside St Mary's Hospital for weeks in an attempt to get the first glimpse of Kate, William and their baby when they leave to go home following the birth. Today, hundreds of members of the public joined them, with many more flocking to Buckingham Palace hoping to get a look at the official announcement when it comes.
It is believed the couple will pose with their bundle of joy on the hospital steps to give the world a picture that will go down in history.
It will also be our first glimpse of the Duchess since her last public engagement in June, when she attended the Trooping the Colour ceremony at Buckingham Palace to celebrate the Queen's birthday.
The child will be third-in-line to the throne after Prince Charles and Prince William and will be given a Prince or Princess Of Cambridge title.
Check out Kate's pregnancy in pictures: