Stewart walked the red carpet of Pattinson's Cosmopolis premiere in a stunning red Reem Acra gown at the Cannes Film Festival in Cannes, France. "He's so good in it!" Stewart gushed to MTV News about Pattinson's performance. "He's really, really [good]. I don't even know how he [did it]. I couldn't even understand it. It's so good, it's so cool, I'm so proud of him. Thank God."