British Prime Minister Boris Johnson and his girlfriend Carrie Symonds secretly got engaged last year and are having a baby this summer. It will be the third marriage and at least the sixth child for Johnson, 55, and the first for Symonds, 31, who announced the news on Instagram. āWeāve got a baby hatching early summer,ā Symonds said. āFeel incredibly blessed.ā They are the first unmarried couple to live at 10 Downing Street, though other prime ministersā wives have given birth while their husbands were in office.