BORIS Johnson and Carrie Symonds have announced that they are expecting a baby in the early summer and that they have got engaged.

Former Scottish Conservatives leader Ruth Davidson was one of the first to congratulate the Prime Minister on the news.

Re-tweeting the news, the MSP wrote: "Congratulations to Boris Johnson and Carrie Symonds."

Labour MP Charlotte Nichols tweeted: "Congratulations to the happy couple notwithstanding, it's truly remarkable that the announcement JUST HAPPENED to be on the day of the unprecedented resignation of top Home Office official Sir Philip Rutnam who will be taking a case of constructive dismissal against the Govt."

Johnson already has four grown-up children with his second wife Marina Wheeler, who he is separated from.

He also has a daughter with art consultant Helen Macintyre.

A spokesperson said: "The Prime Minister and Miss Symonds are very pleased to announce their engagement and that they are expecting a baby in the early summer."