The Duke and Duchess of Sussex have named their newborn son Archie Harrison Mountbatten-Windsor.
According to the BBC, the announcement came after Queen Elizabeth II and Prince Phillip, Duke of Edinburgh met their newest great-grandchild for the first time at Windsor Castle.
Harry and Meghan have chosen not to use a courtesy title for their new son.
Instead, he will simply be known as Master Archie.
His surname, Mountbatten-Windsor, is the personal surname used by some of the male-line descendants of the Queen and the Duke of Edinburgh.
Queen Elizabeth is from the House of Windsor, while Prince Phillip (who was born into the Greek and Danish Royal families) took the surname Mountbatten shortly before their marriage.