- Her grandfather, Jérôme Seydoux, became president of Pathé film corporation in 1990.
- Studied to be an opera singer before switching to acting.
- Modeled for Prada, Levi's and American Apparel.
- Studied with Les Enfants Terribles in France.
- In 2013, the Cannes Film Festival jury decided to award not just director Abdellatif Kechiche the Palme d'Or for Blue Is the Warmest Color, but to have him share the award with the film's two stars, Seydoux and Adéle Exarchopoulos.