E! Online - • Now that she's found her dad, Mamma Mia! gal Amanda Seyfried can start searching for her man. Per Variety, the 22-year-old Big Lover will star in Dear John, Lasse Hallstrom's feature film based on the Nicholas Sparks bestseller, playing a young woman who falls in love with a soldier on leave from Iraq (Channing Tatum). Cameras roll next month in South Carolina. ...