Boris Johnson will become the first British prime minister in nearly 200 years to marry while in office.
When Mr Johnson took the keys to Number 10 last year, he became the first prime minister to do so unaccompanied by a spouse in nearly 50 years.
As Mr Johnoson entered the famous black door as its official occupant, Ms Symonds, the former head of communications for the Conservative Party, watched from the sidelines, along with his staff and supporters.
2020欧洲杯体育足彩外围appAt the age of 31, Ms Symonds is the youngest partner of a prime minister in 173 years.
2020欧洲杯体育足彩外围appIn 1822, Lord Liverpool married for a second time - his first wife died aged just 54 - while he was still in office.
His new wife, Lady Mary Chester, was a friend of his first wife, Louisa.
Before that, Duke of Grafton, the first British prime minister to be divorced, took his second wife, Elizabeth Wrottesley, in 1769.
They had no fewer than nine children. Only two of Britain’s 54 prime ministers since 1721 have been divorced.
2020欧洲杯体育足彩外围appSince World War II, the only single prime minister has been Edward Heath.