At the UK premiere of his new sci-fi blockbuster Disclosure Day, Steven Spielberg was rhapsodising about his leading lady. He'd been in awe of Emily Blunt, he said, ever since she stole the show in The Devil Wears Prada back in 2006. "This is a force of nature and one of the nicest people in the world," he added. "I'm so lucky that she liked our script." He is far from the only one so smitten.