Town crier Tony Appleton, who announced the birth of the new princess, said he was told the Duke and Duchess of Cambridge would be "touched" when he asked if could make the proclamation.
Mr Appleton said he was disappointed to have been labelled a fake by some people when he made the announcement of Prince George's birth two years ago.
"Last time a lot of people said I was a fake and it was absolutely ridiculous because town criers came to England in 1066 and the town crier was specifically employed by the king to proclaim births, executions, weddings, whatever, and obviously this was the birth. So this time I thought 'I'm not going to get caught out"
So last October he wrote to the royal couple asking if they would have any objections second time around.He received a reply which said "I am sure your royal highnesses would be touched by your kind suggestion. Thanks for thinking of them in this way."
Mr Appleton, from Great Baddow in Essex, made his declaration in front of the crowd of reporters, photographers and well-wishers.
He said he was "still on a high" this morning, and plumped for Alice when asked about the princess' name.
Books of congratulation will be available at Cambridge City Council next week to celebrate the arrival of the newest member of the Royal Family.
The Mayor of Cambridge Cllr Gerri Bird says the birth is "tremendous news" and will have a positive impact on the city.
The Mayor of Cambridge has written to the Duke and Duchess of Cambridge to offer congratulations on behalf of the city.
“We look back fondly to the Duke and Duchess’s official visit to Cambridge in November 2012 and hope that we may have the pleasure of welcoming them again, together with Prince George and the new baby, before too long.”
Books of congratulation will be available at Cambridge City Council’s customer service centre and at the main reception in the Guildhall from Tuesday.
Messages of congratulations have been coming in from all over the region after the arrival of a new royal baby.
The Duchess of Cambridge gave birth to a daughter just after half past eight this morning - the official confirmation was mounted on an easel at Buckingham Palace.
When the family leave hospital they'll head to their Norfolk home of Anmer Hall on the Queen's Sandringham Estate.
Click below to watch a report by ITV News Anglia's Stuart Leithes.
The Duke and Duchess of Cambridge will soon head with their daughter to Anmer Hall, the couple's country mansion on the Sandringham estate in Norfolk.
They'll spend the first few weeks as a family of four there.
The ten–bedroom home has undergone a £1.5million refurbishment – from private funds – over the past two years.
The Grade II-listed home, which was a gift from the Queen, has a new roof, as well as a new kitchen, garden room, re-landscaped front driveway and new nursery for Prince George and his new sister.
Essex's 'Royal Town Crier' has once again announced the birth of a royal baby.
Tony Appleton from Great Baddow near Chelmsford proclaimed the news of the royal arrival to waiting crowds outside the hospital.
He first hit the headlines in 2013 when he announced the birth of Prince George.
East Anglia’s Children’s Hospices (EACH) has sent congratulations to the Duke and Duchess of Cambridge on the birth of their baby daughter.
The Duchess of Cambridge became Royal Patron of EACH in January 2012.
“We’d like to sincerely congratulate The Duke and Duchess of Cambridge on the birth of their second child. We’re delighted by the fantastic news.
Her Royal Highness has shown great dedication to the role of EACH Royal Patron from the very beginning in January 2012, right throughout both pregnancies, and we’re incredibly grateful for all the supportthe charity has received."
The Duchess of Cambridge has safely delivered a daughter at 8.34am, Kensington Palace said. Prince William was there for the birth.
The baby weighs 8lbs 3oz. The Duke of Cambridge was present for the birth.
Her Royal Highness and her child are both doing well.
The Duchess of Cambridge has been admitted to hospital in the early stages of labour Kensington Palace has confirmed.
Kate was admitted to the Lindo Wing at St Mary's Hospital, the same ward where she gave birth to Prince George in July 2013.
The new baby, whether a girl or a boy, will become the fourth in line to the throne behind grandfather Prince Charles, father Prince William and big brother Prince George.
After the new royal baby is born, the Duchess and Prince William will head for their home at Anmer Hall, on the Queen's Sandringham Estate in Norfolk.
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