Prime Minister Johnson is not married.
In 1987, he married Allegra Mostyn-Owen. That was annulled in 1993.
Twelve days later he married Marina Wheeler.
Johnson and Wheeler finalised their divorce in February 2020.
On February 29th Johnson announced his engagement to Carrie Symonds.
He is engaged to be married, and his fiancée is expecting.
But he is not currently married.
More details: https://en.wikipedia.org/wiki/Boris_Johnson#Relationships