(FROM VARIETY) ? Singer-actress Beyonce Knowles, Idris Elba (American Gangster), and Ali Larter (Heroes, Resident Evil) have been tapped for Screen Gems’ thriller Obsessed. Elba will play an asset manager with a hot wife (Knowles) and thriving career — until a temp office worker (Larter) begins stalking him. Director Steve Shill (NBC’s Knight Rider telepic) will helm from a script by David Loughery. Will Packer. Beyonce will executive produce along with her father, Mathew Knowles. She is also producing and co-starring as Etta James in Cadillac Records for Sony BMG. Larter is working on episodes of NBC’s Heroes. Elba next stars in Prom Night for Screen Gems. (Variety)