A joyful crowd popped corks, cheered and strained to glimpse the official notice outside Buckingham Palace, after the birth of a baby boy, a future monarch, to Prince William and wife Kate.
The centre of attention at the palace was a golden easel upon which royal officials placed the formal birth announcement on Monday.
"We just wanted to mark the birth in our own way," said Itsuki Kuroda, a Japanese man living in London, who came to get pictures of himself and his wife Kenta with their two-year-old daughter Akari, who was dressed in the red, white and blue of the Union Jack.
"This boy's going to be king one day - it's historic!" Kenta said.
Camera flashes lit up the evening scene outside the Queen's official residence as dozens of people tried to immortalise the moment it was announced that the third in line to the British throne had been born.
The crowds pressed against the iron gates of Buckingham Palace and spilled onto the steps of the huge statues of Queen Victoria and other monarchs in the plaza in front of the vast building.
Cheers went up outside the palace the minute the announcement came, as they did at the central London hospital where the baby was born and where more well-wishers gathered along with hundreds of international media.
"We are delighted to be here, it's a very good feeling and a great atmosphere," said Sylvie Beaver, a 28-year-old from London who was outside the palace with her boyfriend.
Patriotic songs rang out as the night wore on but the atmosphere was still welcoming for foreign visitors.
"We think it's so exciting that there is a new third in line to the throne - we came here on Thursday and were very hopeful we would be here for the exciting news, we don't have royalty, so to us this is very, very exciting," said Janice, a visitor from Ohio in the United States.
Rob, a Londoner, said: "I'm hugely excited - I've been waiting all day for the news and I can't wait to find out the name of the boy. I'm going for Albert."
London's landmarks also joined in the celebrations.
The London Eye, a huge wheel with viewing pods that towers above the capital, was lit up in red, white and blue, while the BT Tower carried the message "It's a boy" on huge digital screens.
The joyous scenes of partying came after a sense of relief earlier in the day for the international journalists who had camped for three weeks outside St Mary's Hospital in Paddington, central London, waiting for Kate to give birth.
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