It's been revealed the new Royal parents and their new son will be making a family home at Anmer on the Sandringham Estate in Norfolk.
Firms from across our region are at Buckingham Palace this weekend as part of a festival to celebrate the Queen's coronation.
A selection of people from Hertfordshire are honoured in the Queen's Birthday Honours list.
The Duke of Cambridge's uncle, Earl Spencer, described his joy at the new royal baby.
"We're all so pleased: it's wonderful news," he said.
The Earl, whose sister was the Duke's mother, Diana, Princess of Wales, added: "My father always told us how Diana was born on just such a blisteringly hot day, at Sandringham, in July 1961. It's another very happy summer's day, half a century on."
It is what the world's been waiting for...... the Duchess of Cambridge has given birth to a baby boy - giving one city more reason to celebrate than most.
The newborn will take on the title of Prince of Cambridge - the first in more than a century.
The new heir has other strong links to our region too. He will be raised at the family home Anmer Hall, on the Sandringham Estate in Norfolk.
The three doctors who delivered the royal baby boy have left the Lindo Wing of St Mary's Hospital in Paddington. Talking to the media outside, Dr Marcus Setchell said "Beautiful baby."
A crier dressed in full regalia announced the birth of the royal baby outside the Lindo Wing of St Mary's Hospital in Paddington. Crowds and members of the media cheered and shouted throughout.
Foreign Secretary William Hague has tweeted his congratulations to the Duke and Duchess of Cambridge, saying the news of the birth of their son was a happy moment for "our country and Overseas Territories."
My warmest congratulations to the Duke and Duchess of Cambridge. Wonderful news and a happy moment for our country and Overseas Territories
Crowds of thousands from across the world have gathered outside Buckingham Palace to celebrate the birth of the royal baby.
The four hour delay before the birth was announced was to give Kate and William some time with the baby.
The Prime Minister has said the birth of the royal baby is an "important moment in the life of our nation."
Mr Cameron said: "Its wonderful news from St.Mary's Paddington and I'm sure right across the country and indeed across the Commonwealth people will be celebrating and wishing the Royal couple well.
"It is an important moment in the life of our nation, but I suppose above all its a wonderful moment for a warm and loving couple who got a brand new baby boy.
"It's been a remarkable few years for our royal family - a Royal wedding captured peoples hearts, that extraordinary, magnificent Jubilee and now this royal birth.
"All from a family that have given this nation so much incredible service and they can know a proud nation is celebrating with a very proud and happy couple tonight. "