Carrie Symonds, the fiancee of British Prime Minister Boris Johnson, has given birth to the couple's baby.

The "healthy baby boy" was born at a hospital in London, according to a spokesman.

The couple thanked the team of doctors and nurses who had seen Symonds through her pregnancy, the spokesman added.

Johnson returned to his office at 10 Downing Street on Monday after recovering from coronavirus.

Twice-married Johnson and Symonds became engaged at the end of last year. It is not known whether the prime minister will take paternity leave to spend time with his new son.