A Burning Hot Summer (pre-release title: That Summer) is a 2011 drama film directed by Philippe Garrel, starring Monica Bellucci, Louis Garrel, Céline Sallette, and Jérôme Robart.
 Its original French title is Un été brûlant, which means "A burning summer".
 The film portrays a tempestuous relationship between an actress and a painter.
Two Friends (French: Les Deux Amis ) is a 2015 French romantic dramedy film directed by Louis Garrel and co-written by Garrel and Christophe Honoré.
 The film is loosely based on the play "The Moods of Marianne" by Alfred de Musset.
 It was selected to screen in the International Critics' Week section at the 2015 Cannes Film Festival.
Frontier of the Dawn (French: La Frontiere de l'Aube ) is a 2008 French drama film directed by Philippe Garrel.
 The film stars Louis Garrel, Laura Smet, and Clémentine Poidatz and was photographed by cinematographer William Lubtchansky in black and white.
 It premiered at the 2008 Cannes Film Festival in competition.
Regular Lovers (French: Les Amants réguliers ) is a 2005 French independent coming-of-age romantic drama film directed by Philippe Garrel and starring his son, actor Louis Garrel.
 The director's father, actor Maurice Garrel, has a supporting role.
The Dreamers is a 2003 romantic drama film directed by Bernardo Bertolucci.
 The screenplay is by Gilbert Adair, based on his own novel "The Holy Innocents".
 An international co-production by companies from France, the United Kingdom, and Italy, the film tells the story of an American university student in Paris who, after meeting a peculiar brother and sister who are fellow film enthusiasts, becomes entangled in an erotic conflict.
 It is set against the backdrop of the 1968 Paris student riots.
 The film makes several references to various movies of classical and New Wave cinema, incorporating clips from films that are often imitated by the actors in particular scenes.
Dans Paris (English: Inside Paris) is a 2006 film starring Romain Duris, Louis Garrel, Guy Marchand, Marie-France Pisier, and Joana Preiss.
 It concerns two brothers, Paul (Duris) and Jonathan (Garrel), who attempt to help one another out of their respective troubles and worries while living with their divorced father, Mirko (Marchand).
 Paul has broken up with Anna (Priess), while Jonathan is a womanizer.
Saint Laurent is a 2014 French biography drama film co-written and directed by Bertrand Bonello, and starring Gaspard Ulliel as Yves Saint Laurent, Jérémie Renier as Pierre Bergé, and Louis Garrel as Jacques de Bascher.
 The supporting cast features Léa Seydoux, Amira Casar, Aymeline Valade and Helmut Berger.
 The film centers on Saint Laurent's life from 1967 to 1976, during which time the famed fashion designer was at the peak of his career.
 The film competed for the Palme d'Or in the main competition section at the 2014 Cannes Film Festival and was released on 24 September 2014.
Mon Roi, also known as My King, is a 2015 French drama film directed by Maïwenn.
 The film stars Vincent Cassel, Emmanuelle Bercot, Louis Garrel and Isild Le Besco (Maïwenn's sister).
 It was selected to compete for the Palme d'Or at the 2015 Cannes Film Festival.
 At Cannes, Bercot won the award for Best Actress.
Ismael's Ghosts (French: Les Fantômes d'Ismaël ) is a 2017 French drama film directed by Arnaud Desplechin, starring Mathieu Amalric, Marion Cotillard, Charlotte Gainsbourg and Louis Garrel.
 The film follows a filmmaker whose life is sent into a tailspin, just as he is about to start shooting a new film, by the return of his wife, who disappeared 20 years ago and whom he thought dead.
 "Ismael's Ghosts" premiered at the 2017 Cannes Film Festival as the opening film.
Louis Garrel (born 14 June 1983) is a French actor and filmmaker.
 He is best known for his starring role in "The Dreamers", directed by Bernardo Bertolucci.
 He regularly appears in films by French director Christophe Honoré, including "Ma mère", "Dans Paris", "Les Chansons d'amour", "La Belle Personne" and "Non ma fille, tu n'iras pas danser".

Question: which  2003 romantic drama film did Louis Garrel starred in 
Answer: The Dreamers