CANNES Ryan Gosling is the latest Hollywood star to unveil his work at the Cannes Film Festival. And while the actor stepped behind the camera to direct “Lost River” - he was the center of attention at the movie’s premiere. Joining him on the red carpet was his leading lady Christina Hendricks of “Mad Men” fame. Elsewhere at the fest, Salma Hayek has been making the rounds in promotion of “The Prophet”. The movie is a labor of love for Salma – who produced the animated feature. Cannes is not only about plugging projects, it’s also known for its fabulous parties. And the De Grisogono bash drew in everyone from socialites Paris Hilton, Cara Delevingne and Tamara Ecclestone to Sharon Stone and Rosario Dawson.