British Prime Minister Boris Johnson’s fiancée, Carrie Symonds, on Wednesday, gave birth to a “healthy baby boy” in a London hospital, a spokesman for the couple said.

“Both mother and baby are doing very well,” the spokesman said in a surprise announcement, as Symonds was not thought to be due until later in the year.

 Johnson, 55, and Symonds, 32, announced in February that they were engaged and expecting a child together. At the time they said the baby was due in early summer. No wedding date has been announced.

Symonds, an environmental campaigner and former Conservative Party staffer, also said she was sick for a week with COVID-19 symptoms, though she wasn't tested for the virus. The newborn boy is her first child.

Johnson has four children with his second wife Marina Wheeler, from whom he is divorced, and has fathered at least one other child outside his marriages.

The baby is the third born to a sitting British prime minister this century. The wives of leaders Tony Blair and David Cameron also had babies while their husbands were in office.