On 12 June 1946, she married
Hugh Percy, 10th Duke of Northumberland at
Westminster Abbey. Guests included
King George VI and
Queen Elizabeth,
Queen Mary,
Princess Elizabeth and
Princess Margaret. Upon marriage, she became the
Duchess of Northumberland. They had seven children: • Lady Caroline Mary Percy (born 3 May 1947), married Pierre, Comte de Cabarrus, and had issue. They were later divorced. • Lady Victoria Lucy Diana Percy (born 19 April 1949), married John Aiden Cuthbert in 1975 and had issue. They were divorced before 2000, and she married, secondly, Charles Timothy Lyon Fellowes in 2000. • Lady Julia Helen Percy (born 12 November 1950), married Nicholas Robert Craig Harvey on 11 June 1983 and had issue. •
Henry Alan Walter Richard Percy, 11th Duke of Northumberland (1 July 1953 – 31 October 1995). •
Ralph George Algernon Percy, 12th Duke of Northumberland (born 16 November 1956), married
Isobel Jane Richard and has issue • Lady Louise Percy (25 May 1962 – 27 May 1962) • Lord James William Eustace Percy (b. 18 June 1965), married Lucy Caroline Rugge-Price in 2000 and has issue. ==Later life==