The British Prime Minister Boris Johnson and his fiancée Carrie Symonds have announced the birth of a "healthy baby boy".
Both mother and baby are "doing very well" following the birth at a London hospital on Wednesday morning, their spokeswoman said.
It is understood Mr Johnson was present throughout the birth.
"The PM and Ms Symonds would like to thank the fantastic NHS maternity team," their spokeswoman said.
Mr Johnson only returned to work on Monday, after spending time in intensive care with the coronavirus.
Ms Symonds also suffered symptoms of the disease.
The couple announced at the end of February that they were expecting a baby in "early summer" and they became engaged at the end of last year.
Mr Johnson has previously suggested he intends to take paternity leave - although it is not known if this remains the case given the COVID-19 crisis.
Mr Johsnon's father Stanley Johnson said he was "absolutely delighted" and "thrilled" by the birth of his grandson.
There were also messages of support from across British politics.
British Health Secretary Matt Hancock posted on Twitter: "So thrilled for Boris and Carrie. Wonderful to have a moment of unalloyed joy!"
UK Chancellor Rishi Sunak tweeted: "Great to hear Downing Street is getting a new resident. Congratulations to @BorisJohnson and @carriesymonds on the birth of their son."
UK Labour leader Keir Starmer said: "Wonderful news. Many congratulations to Boris Johnson and Carrie Symonds."
Some good news - sending congratulations to Carrie and the PM. And wishing health and happiness to the wee one. https://t.co/V2k1KKqVN7
— Nicola Sturgeon (@NicolaSturgeon) April 29, 2020
And Scottish First Minister Nicola Sturgeon wrote: "Some good news - sending congratulations to Carrie and the PM. And wishing health and happiness to the wee one."
Mr Johnson already has four grown-up children with his second wife Marina Wheeler.
He also has a daughter with art consultant Helen Macintyre.
There has been speculation that Mr Johnson has fathered another extra-marital child.
Asked how many children he had in November, he told LBC: "I love my children very much but they are not standing at this election. I'm therefore not going to comment on them."
