She married Londonderry on 16 May 1958, when she was seventeen. They made their home at
Wynyard Hall and had two children: •
Lady Sophia Frances Anne Vane-Tempest-Stewart (born 1959), who married Jonathan Mark Pilkington and has children. • Lady Cosima Maria-Gabriella Vane-Tempest-Stewart (born 1961), who married firstly Cosmo Fry and secondly Lord John Robert Somerset, with whom she has children. The paternity of her elder son, Tristan Alexander (born 1969), who briefly held the
courtesy title Viscount Castlereagh, was contested when he was about 18 months old, and he was confirmed to be the son of
Georgie Fame (real name Clive Powell), with whom the young Marchioness had been having an extramarital affair. One of the Marchioness's daughters, Lady Cosima, later claimed that her true father might be the musician and writer
Robin Douglas-Home. The divorce of Lord and Lady Londonderry in 1971 was the subject of considerable publicity. The following year on 25 February 1972, the Marchioness married Georgie Fame at
Marylebone Register Office, and her married name became Nicolette Powell. Londonderry subsequently married the ballerina
Doreen Wells. As Nicolette Powell, the former Marchioness gave birth to a second son of Georgie Fame, James Michael, in 1973. ==Later life==