It's the name we have all been waiting for! The Duke and Duchess of Cambridge have revealed that their new baby boy is called Louis Arthur Charles.
Kate Middleton gave birth to a baby brother for Prince George and Princess Charlotte at 11:01am on Monday 23 April, but we did not know what he was called until now.
Kensington Palace said the Queen, the Duke of Edinburgh, the Prince of Wales, the Duchess of Cornwall, Prince Harry and members of both families were "delighted with the news" of the new arrival.
Little Louis is fifth in line to the throne - behind Prince Charles, Prince William, Prince George and Princess Charlotte - and is now the Queen's sixth great-grandchild.
