The Deputy Prime Minister said:
Miriam and I want to congratulate The Duke and Duchess of Cambridge on the birth of their son. This is wonderful news which will make the whole country smile.
The arrival of a first child is a very special time and we send our very best wishes to The Duke and Duchess of Cambridge - and indeed to all couples who have become proud parents on this very special day.
Photo credit: John Stillwell/PA Wire/Press Association Images