- Father, with Marion Cotillard, of son Marcel Canet (b. May 19, 2011) and daughter Louise Canet (b. March 16, 2017).
- Is very good friends with ex-wife Diane Kruger.
- Boyfriend of Marion Cotillard since October 2007. They had been friends since 1997, and in 2003, they starred together in the film Love Me If You Dare (2003).
- As an actor, he hates auditioning
- His favorite's musicians are Janis Joplin, Al Green, Curtis Mayfield and Jacques Brel. He also loves music of the Blaxploitation.
- Originally wanted to become a professional horseman but was forced to change his career aspiration after an accident.
- Was hired by a circus at age 10.
- Guillaume and Marion Cotillard are expecting their first child in the Spring of 2011 [January 10, 2011].
- Marina Hands was his first girlfriend. After his divorce from Diane Kruger in 2006, he had relationships with Carla Bruni, Élodie Navarre and Louise Bourgoin.
- One his favorite works of art is "The thinker" by Auguste Rodin.
- Former member of France's obstacle jumps horse riding.
- Good friends with soccer player Bixente Lizarazu.
- Has two sisters.
- Is a natural blonde.
- Studied at Saint-Louis-Notre-Dame-Du-Bel-Air school, as a child.
- His parents were horse breeders.
- Originally wanted to be a professional horse-rider, but after an accident at age 18 he stopped and became an actor.
- His favorite actor is Patrick Dewaere.
- Voted #11 in Elle (France) Magazine's "15 Sexiest Men" poll. (June 2007)
- Ranked #7 on Challenges list of France's highest paid actors. (2007)
- Supporter of the European Leucodystrophia Association.
- Briefly studied at the Cours Florent.
- Studied at the Cours Florent.
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