Kate Middleton has officially arrived at the private Lindo Wing at St Mary's Hospital in London.
Kensington Palace confirmed: 'Her Royal Highness The Duchess of Cambridge was admitted to St. Mary’s Hospital, Paddington, London earlier this morning in the early stages of labour. The Duchess travelled by car from Kensington Palace to the Lindo Wing at St. Mary’s Hospital with The Duke of Cambridge.'
The duchess and Prince William have opted to not know the sex of her their child, a pattern they have followed throughout all three pregnancies.
The baby prince or princess will be fifth in line to the throne, the Queen and the Duke of Edinburgh's sixth great-grandchild and a younger brother or sister for Prince George and Princess Charlotte.
The baby's title will be His Royal Highness Prince or Princess of Cambridge.
With George, the duchess gave birth 10-and-a-half hours after being admitted to hospital, but Charlotte was born just two hours and 34 minutes after Kate arrived at the Lindo Wing.
Predicted names include Alice, Alexandra, Elizabeth, Mary and Victoria for a girl and Arthur, Albert, Frederick, James and Philip for a boy.