In 2006, British actress Emily Blunt was a virtual unknown on American movie screens when she managed to steal every scene from veteran thespians Meryl Streep and Stanley Tucci in the hit comedy, “The Devil Wears Prada.” Her over-the-top performance as Streep’s high-strung assistant put her in the international spotlight, steering her career away from prior British period television pieces and towards memorable supporting roles in “The Jane Austen Book Club” (2007) and the Steve Carell comedy, “Dan in Real Life” (2007). The breadth of Blunt’s versatility and her love of unusual, unhinged