William and Kate thanked well-wishers around the world on the eve of Prince George's first birthday.
Prince William will rejoin his former rejiment in order to be based in London with his wife and son.
After weeks of speculation over the arrival of the royal baby, Kate was taken to hospital shortly before 5am.
The Duchess of Cambridge is in the early stages of labour and has been admitted to hospital, a royal spokesman said.
The Duchess of Cambridge was dubbed "Waity Katie" before Prince William proposed to her. Now the nickname has resurfaced.
The duke and duchess receive gifts ranging from practical to bizarre ahead of Baby Cambridge's birth.
Queen Elizabeth and Prince Charles's wife Camilla give their thoughts as Britain awaits 'Baby Cambridge'.
The name, sex and date of "Baby Cambridge" draw a record number of bets for a non-sports market.
The media frenzy over the birth of Prince William and Catherine's baby reached fever pitch as the due date came and went.
British Parliament passed a new rule that automatically guarantees the throne for any firstborn royal female.
Betting shops in the UK have seen a flurry of activity as people who do not normally gamble make a bet on the royal baby.
A chopper once used to circumnavigate the globe in record time will transport this father-to-be on D-day.
Britain's defence ministry says Prince Harry has qualified to command an Apache attack helicopter.
Bookmakers say wagers on the arrival of Prince William and Catherine's first child will outstrip those for their wedding.
Could the Duke and Duchess of Cambridge be fudging the baby's due date to retain some privacy and shake off the media?