A formal bulletin confirming the birth was displayed at Buckingham Palace
Congratulatory messages are flooding in from around the world to mark the birth of the Duke and Duchess of Cambridge's son, the third in line to the throne.
Congratulatory messages are flooding in from around the world to mark the birth of the Duke and Duchess of Cambridge's son, the third in line to the throne.
Prince William said the couple "could not be happier" following the birth of the boy, who weighed 8lb 6oz and is yet to be named, at 16:24 BST on Monday.
Thousands of well-wishers descended on Buckingham Palace after the news broke.
The royal birth will be marked later with gun salutes and the ringing of Westminster Abbey's bells.
The duke was at the private Lindo Wing of St Mary's Hospital, west London, for the birth - and stayed with Catherine and the baby overnight.
BBC royal correspondent Peter Hunt said it was unclear how long the baby would be kept in hospital.