
In 2002, after completing the filming of Taxi 3, it no longer. wishes to be part of the team. A year later, thanks to Tim Burton and the film Big Fish, it became known across the Atlantic. The same year, it was alongside Guillaume Canet and in a very French movie she plays Sophie in Children's Games. The following year, she appeared in A Very Long Engagement and received the Cesar for Best Actress in a Supporting Role. In 2007, she hits the headlines by playing the role of Edith Piaf in La Vie en Rose by Olivier Dahan, who quickly became a worldwide success. His fee to turn in La Vie en Rose totaled € 450 000. With this film, the young actress received over twenty awards notament Golden Globe, BAFTA, César, and the 2008 Oscar for Best Actress.
She is currently the only actress to have accumulated as much reward for the same role. In 2008, Bastien Duval directed the documentary My clown , which tracks Marion Cotillard in the year of the global promotion of La Vie en Rose. She also becomes the brand ambassador for Dior. Consequently, Hollywood holds out his arms and began a career there with the movie Public Enemies in 2009 alongside Johnny Depp, then in Nine with Nicole Kidman, Kate Hudson and Penelope Cruz. She is back in France and played in The Last Flight alongside Guillaume Canet. It continues in its momentum and turns in Inception with Leonardo DiCaprio and then in Little White Lies directed by his companion Guillaume Canet.

She now wants new projects such as becoming a mother. Marion Cotillard is an activist environmentalist of Greenpeace. She refuses such an advertising contract with L'Oreal , the cosmetics brand as is blacklisted by Greenpeace. In 2009, she participated in the recording of the song Beds are Burning, message from Kofi Annan for the ecology, to mobilize the population for the Copenhagen Summit held in December 2009. Marion went along with other activists from Greenpeace, to fight against the deforestation of the massive Congo Basin forest. She is also patron of the Foundation Maud Fontenoy, which aims to protect ocean environments. In October 2010, Marion finds in many colleges of Paris, accompanied by Maud Fontenoy and Borloo (then Minister of Ecology), to educate children about biodiversity and marine emergency protection.
It officially supports the Chief Raoni in its fight against the Belo Monte dam and sign his petition. She is also supports the association Wild-Touch sponsoring Forest of rain, a film project and " cross media "on the last major primary forests of the world and the dangers they face. In an interview broadcast on Paris Premiere on 16 February 2007, more than a year before she received her Oscar, Marion Cotillard wondered if the Americans really walked on the moon in the 1970s, questioned the circumstances the death of Coluche and denied the official version of the events of September 11, 2001.

Subsequently she had a relationship with singer Sinclair and with actor Stephan Guerin-Tillié. Since 2007, she was the companion Guillaume Canet. The couple is still very discrete, appearing together on rare occasions. She expressed, in 2010 in the press, of its wish to become a mother. Marion Cotillard gave birth to a baby boy, named Marcel, 19 May 2011. In April 2012 she visited Florence Break in the women's prison Tepeplan in Mexico.