Bianca Lamblin (maiden name: Bienenfeld) was a French writer who was romantically involved with both Jean-Paul Sartre and his lifelong companion Simone de Beauvoir, for a number of years. Her book, 'Mémoires d'une Jeune Fille Dérangée' (published in English under the title, "A Disgraceful Affair"), is an account of her long-lasting involvement with two of the most prominent French thinkers of the twentieth century.
In correspondence between Sartre and Beauvoir, the pseudonym Louise Védrine was used when referring to Bianca in Lettres au Castor and in Lettres à Sartre. Lamblin later lamented of being abused by both Sartre and Beauvoir.