UK PM Boris Johnson, partner move into 10, Downing Street, first unmarried couple to do so

"There won't be any additional cost to the taxpayer,” Johnson's spokesperson said, implying that Symonds would not be provided with any publicly-funded staff usually associated with a First Lady.

Britain’s new Prime Minister Boris Johnson moved into Downing Street on Monday with his partner Carrie Symonds, becoming the first unmarried couple to live in the world-famous address in London. Johnson, 55, had been living with Symonds, 31, at her flat in south London in the lead up to the Conservative Party leadership contest, the result of which meant he took charge as Prime Minister last week.