A glorious Union flag was raised on April 23 to signify the birth of the Duke and Duchess' third child, a healthy baby boy weighing in at 8lbs 7oz at 1101 hours on St. Georges Day.
"We've been coming out doing this for 21 years", said John Loughrey, 63, from south London, who was wearing a Union Jack onesie and hat and holding a baby doll adorned with a crown.
The prince, whose name has not yet been announced, was wrapped up in a bundle in Kate's arms as his proud parents waved at the crowd of hundreds that had gathered.
Kate, dressed in a floral dress with her hair in curls, gave birth to Charlotte on the same day that she and William left the hospital with their newest addition.
Historian Judith Rowbotham predicted William and Kate would pick Philip for the new baby prince, in tribute to the Duke of Edinburgh. "They would also like to thank everyone for their warm wishes". Meanwhile, their daughter, Charlotte Elizabeth Diana referred to William's mother and grandmother.
Television crews, journalists and royal fans had set up camp outside the hospital for the "royal baby watch" since early April in anticipation of the arrival.
Amy Thompson, 18, had been camping out for 15 days.
"It's very easy to talk about a bloated royal family but it's not really fair because the queen has an enormous amount of requests of things to do and her family are there to support her".
"We're very proud of our monarchy".
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The words "it's a boy" were flashed in lights around the top of London's BT Tower, which can be seen for miles around.
Meanwhile sailors and royal marines aboard HMS Albion lined up on the flight deck of the assault ship on operations in the Asia-Pacific region to spell out "boy!"
Prince George and Princess Charlotte had visited their brother at the Lindo Wing of St Mary's Hospital, London. The prince's second name, Alexander, honors the queen, whose full name is Elizabeth Alexandra Mary.
Another royal baby has arrived.
The Duchess of Cambridge has given birth to her third child a baby boy.
A night at the Lindo Wing costs £7,500 ($10,500, 8,550 euros), including a delivery package and two-room suite, excluding consultants' fees.
Kensington Palace said the medical staff who assisted in the birth were Mr Guy Thorpe-Beeston, Surgeon Gynaecologist to the Royal Household, Alan Farthing, Surgeon Gynaecologist to Her Majesty The Queen, Dr Sunit Godambe, Consultant Neonatologist at Imperial College NHS Trust and Professor Huw Thomas, Physician to Her Majesty The Queen and Head of the Medical Household.
The birth comes just weeks before the wedding of Harry and Markle at St George's Chapel in Windsor on May 19. At the time, she was said to be suffering from hyperemesis gravidarum, which involves nausea and vomiting more severe than the typical morning sickness many women suffer during early pregnancy.
"Her Royal Highness The Duchess of Cambridge was safely delivered of a son at 1101hrs".
More ceremonial celebration will come Tuesday, including the pealing of bells at Westminster Abbey and a gun salute in London's Hyde Park.