Carrie Symonds and her partner Boris Johnson have announced that they are expecting a baby in early summer and are engaged.
Symonds posted on Instagram that she and Johnson have been engaged since the end of last year, and that she felt "incredibly blessed".
On the social media platform, she wrote “Many of you already know but for my friends that still don't, we got engaged at the end of last year... and we've got a baby hatching early summer.”
Johnson and Symonds made history last year as the first unmarried couple to move in to Downing Street.
The couple met in 2012 when Symonds acted as an advisor during Johnson’s second campaign for mayor and have been romantically linked since early 2019.
Symonds is now a senior advisor for Oceana, a US environmental campaign, following her position as adviser to Zac Goldsmith and communications chief for the Tory party.
Johnson’s marriage to Symonds will be his third, following his divorce from Marina Wheeler, who he married in 1993 and has four children with.
He will be the first prime minister to have been both divorced and married in office since Augustus Henry FitzRoy, the third Duke of Grafton, who remarried in 1769.
The timing of the announcement has been criticised, with critics noting the prime minister has lost a chancellor and the pressure his home secretary is under due to allegations of bullying.