Gun salutes are sounding across London to mark the birth of the royal baby.
The King's Troop Royal Horse Artillery and the Honourable Artillery Company are both carrying out the ceremonial salutes in honour of the new addition to the Royal Family.
Gun salutes are fired for the birth of every prince or princess, no matter where their place is within the line of succession, the Ministry of Defence said.
The King's Troop Royal Horse Artillery, wearing full dress uniform, rode past Buckingham Palace to Green Park where they are staging a 41 royal gun salute.
The Honourable Artillery Company (HAC), the City of London's Army Reserve Regiment, are firing a 62 royal gun salute from Gun Wharf at the Tower of London.
ITV News' Business Editor, Laura Kuenssberg, looks at how the royal baby could provide a much needed boost to the economy.
As news of the royal birth is celebrated around the globe a flood of souvenirs and memorabilia will go on sale to mark the occasion.
In London and around the world politicians, celebrities and members of the public have been celebrating the news of the royal birth.