Filmmaker Steven Spielberg, head of the competition jury, announced that he and the other jurists including Oscar-winning actors Nicole Kidman, Christopher Waltz and Bollywood actress Vidya Balan, had decided to formally recognise not only the movie's director but also its two young actresses, Adele Exarchopoulos and Lea Seydoux.
'Blue is the Warmest Colour' is a three-hour coming-of-age movie in which Exarchopoulos plays a 15-year-old, who falls in love with an older woman, played by Seydoux.
The second place Grand Prix went to another popular choice, the Coen brothers' 'Inside Llewyn Davis'. A bleak comedy set in the early 60s folk scene of Greenwich Village, the film has made a star of its lead actor Oscar Isaac and it was he who collected the award in place of the directors.
Another American to receive a significant award was Bruce Dern, who was named best actor for 'Nebraska'.
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Alongside Kechiche, France's other big award of the night went to Berenice Bejo, who was dramatically crowned with the best actress award for 'The Past', from Iranian director Asghar Farhadi, an honour that sees her catapulted into the front rank of French actors after her career-making role in the Oscar-winning silent film 'The Artist'.
The best screenplay was given to Jia Zhang-ke for 'A Touch of Sin'. The prize for Un Certain Regard, a sidebar section, went to 'L'Image Manquante', a feature from the Cambodian filmmaker Rithy Panh.
The award for the Camera d'Or, for the best first feature, went to 'Ilo Ilo', from the Singaporean director Anthony Chen.