Watch: Kate Middleton,wife of UK's Prince William, gives birth to baby boy
Kate, wife of UK's Prince William, gave birth to a baby boy on Monday, the couple's third child, her husband's office said.
The boy, the couple's second son, weighed 8 lbs 7oz and William was present for the birth.
"The Queen, The Duke of Edinburgh, The Prince of Wales, The Duchess of Cornwall, Prince Harry and members of both families have been informed and are delighted with the news," Kensington Palace said.
"Her Royal Highness and her child are both doing well."
The Duchess of Cambridge, Kate Middleton was admitted to a hospital in London on Monday after going into an early stage of labour.
Both the Duchess and her husband William the Duke of Cambridge had not asked about the sex of the baby in routine checkups as they wanted it to be a surprise.
This is going to be a third child after Prince George and Princess Charlotte.