Baroness Sybille de Selys Longchamps (born 28 August 1941) is a Belgian noblewoman.
She is the former mistress of King Albert II, with whom she has a daughter, Princess Delphine.
[2] In 1968, De Selys Longchamps gave birth to daughter Delphine Boël while engaged in an extra-marital relationship with Prince Albert (later King) of Belgium.
The Baroness told the interviewer that she and the Prince took no precautions in their affair, as she thought she was unable to become pregnant.
[4] [5] De Selys Longchamps moved to London in 1976 where she lived with her second husband at his rural estate.