MAMMA MIA! Genre: Comedy/RomanticDirector: Phyllida LloydRelease Date: 18 July 2008 (USA)Cast: Meryl Streep, Amanda Seyfried, Colin Firth, Pierce Brosnan 18-year-old Sophie Sheridan (Amanda Seyfried) has a problem. It's almost her wedding day and she doesn't know who her father is. It could be any…