New King of England, Scotland, and Northern Island
Congratulations to the Duke and Duchess on their new, future king of England, Scotland and Northern Island!
Just in case you are not 'au fait' with the laws of succession, even if the first child had been a girl, she would be the future sovereign (the law was recently changed; before, it was the first male heir, etc. etc.)
It only took a thousand years for them to get it right......