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Delon is the daughter of Alain Delon and Rosalie van Breemen. She has a younger brother, Alain-Fabien Delon, and two older half-brothers, Christian Aaron Boulogne, from her father's affair with German singer, actress and model Nico, and Anthony Delon, from his marriage to actress and model Nathalie Delon. She is the aunt of the supermodel Alyson Le Borges. She has different colored eyes, one brown and one blue.

At age 12, Delon appeared alongside her father in the TV film Le Lion, an adaptation of the novel by Joseph Kessel. From 2007 to 2010, she trained at the Cours Simon in Paris. In 2011, she performed with her father on stage at the Théâtre des Bouffes-Parisiens.

In 2015, Delon was a participant in the game show Fort Boyard.

In November 2019, it was announced Delon was expecting a child with her boyfriend Julien Dereims. Their son was born on 14 February 2020. They have been married since 2021.