Mamma Mia! MAMMA MIA! (2008) Starring Amanda Seyfried, Meryl Streep, Pierce Brosnan, Christine Baranski, Colin Firth, Julie Walters, Stellan Skarsgård, Dominic Cooper, Rachel McDowall and Ashley Lilley. Screenplay by Catherine Johnson. Directed by Phyllida Lloyd. Distributed by Universal Pictures. 108 minutes. Rated PG-13. Mamma Mia! has been a bit of a surprise as a theatrical phenomenon – and yet in a lot of ways it makes perfect sense. It is a light as air confection, a lo