Prime Minister Boris Johnson and his fiancee 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.

"The PM and Ms Symonds would like to thank the fantastic NHS maternity team," the spokeswoman added.

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. They've been living together in 10 Downing Street since July and have adopted a dog, Dilyn.

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. Dominic Raab will stand in for Mr Johnson at prime minister's questions later.

Messages of support from across politics poured in following news of the birth.

"So thrilled for Boris and Carrie. Wonderful to have a moment of unalloyed joy!" Health Secretary Matt Hancock

"Great to hear Downing Street is getting a new resident. Congratulations to @BorisJohnson and @carriesymonds on the birth of their son." - Chancellor Rishi Sunak

"Wonderful news. Many congratulations to Boris Johnson and Carrie Symonds." - Labour Leader Sir Keir Starmer

"Some good news - sending congratulations to Carrie and the PM. And wishing health and happiness to the wee one." - Scottish First Minister, Nicola Sturgeon

Ms Symonds announced she was pregnant in February in a post on her Instagram account.

"I wouldn't normally post this kind of thing on here, but I wanted my friends to find out from me," she wrote.

"Many of you already know, but for my friends that still don't, we got engaged at the end of last year, and we've got a baby hatching early summer. Feel incredibly blessed."