The Duchess of Cambridge has been admitted to St Mary's Hospital, Paddington, in the "early stages of labour", Kensington Palace has announced.
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The Duchess travelled by car from Kensington Palace to the Lindo wing at St Mary's Hospital with The Duke of Cambridge in the early hours of Monday morning.
Kate has given birth to her two children, George and Charlotte, at St Mary's Hospital. A police guard has been established outside the Lindo wing.
As with her previous two pregnancies, Kate, 36, has suffered from hyperemesis gravidarum, or severe morning sickness.
The Queen, who turned 92 on the weekend, will be the first person to be told of the birth of the baby, who will be fifth in line to the throne.
Buckingham Palace will announce the arrival of Prince William and Catherine’s third child with the a traditional bulletin on show at the palace.
The formal announcement will confirm the sex of the baby and the time of birth.
As with George and Charlotte, Kensington Palace will email an initial official announcement to the press, which will coincide with a confirmation of the birth via Twitter.
News of the new arrival will be announced with the Queen and members of both families have been informed.