Duchess of Cambridge in early stages of labour
The Duchess of Cambridge has been admitted to hospital in the early stages of labour, the BBC reports.
Catherine was admitted to the Lindo Wing at St Mary's Hospital in west London where her first child, Prince George, was born in July 2013.
Kensington Palace said "labour is progressing as normal" for the duchess, who was taken to the hospital by car.
Officials have said the duchess and her husband, Prince William, do not know the sex of their unborn child.
The duchess travelled from Kensington Palace with Prince William and was admitted at 06:00 BST (05:00 GMT).
Catherine, who is thought to be overdue, is being looked after by consultant obstetrician Guy Thorpe-Beeston.
He will be joined in the delivery room by Alan Farthing, the Queen's surgeon-gynaecologist.
The new baby will be fourth in line to the throne, behind his or her grandfather Prince Charles, father Prince William and brother Prince George.