- Actress Catherine Deneuve was once his muse. He dressed her for the films Belle de Jour (1967), Heartbeat (1968), Mississippi Mermaid (1969), A Cop (1972), and The Hunger (1983).
- Was the protégé of Christian Dior.
- Attained the dubious distinction in 2009 of meriting the number one position on Forbes magazine's list of "Top-Earning Dead Celebrities". YSL's amassed fortune of $350 million after his death, placed the fashion icon ahead of the likes of 'Michael Jackson (I)' and Elvis Presley.
- His Paris salon was frequented by a posh clientèle including: Princess Lee Radziwill and her sister, Jacqueline Kennedy.
- Longtime companion of Pierre Bergé.
- Their paternal great grandmother Émilie Leblond, born In Veracruz, Mexico was a model for the statue of Oceania by sculptor Auguste Bartholdi.
- His younger sister Michèle Mathieu-Saint Laurent born Oran 25 July 1942 died in Lausanne 5 February 2020. She was a friend of model Victoire Doutreleau who worked for Dior and Saint Laurent.
- Son of Charles Saint Laurent and Lucienne Mathieu.
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