The first 20 minutes of Dreamworks/Paramount’s Dreamgirls starring Beyoncé Knowles and Jamie Foxx screened at the Cannes Film Festival tonight and received big applause from the media, distributors and VIPs inside the Martinez Hotel. Dreamworks’ David Geffen, Viacom’s Tom Freston, Paramount Pictures’ Brad Grey and Gail Berman were all spotted inside the screening. Almost as big a reaction, but not quite, as the reception for Volver, the latest from director Pedro Almodovar, starring Penelope Cruz, which scored big, big applause. People are saying it’s his best.