The tall, blond and blue-eyed Lady Mary, and her three sisters—called the Beauchamp Belles—were left in charge of Madresfield Court.

The wedding, which was attended by two of Lady Mary's sisters, two witnesses and a Russian priest, took place on 31 May 1939 in the Chelsea register office.

A religious service was held the next day in a Russian Orthodox church on Buckingham Palace Road.

Grand Duke Vladimir Kirillovich of Russia, head of the House of Romanov, created her Princess Romanovsky-Pavlovsky, with the style of Serene Highness, at her husband's request.

[citation needed] In February 1956, the couple divorced on the grounds of Prince Vsevolod's adultery, and in 1957, she resumed the lifestyle she was accustomed to as the daughter of an earl, with the surname of Lygon.