Colin Firth, Stellan Skarsgard and Christine Baranski are joining the cast of the musical, Mamma Mia! for Universal Pictures and Tom Hanks' Playtone.

The film is the adaptation of the popular ABBA musical; Phyllida Lloyd is directing the musical. The trio join Meryl Streep, Pierce Brosnan and Amanda Seyfried in the production. The story revolves around a bride-to-be (Seyfried) and her formerly rebellious mom (Streep) who raised her on a Greek island and never disclosed the identity of her father, says The Hollywood Reporter. The bride locates three men who might be her father and invites them to her wedding. Firth is one of the three possible fathers, a British businessman; Skarsgard plays another possible dad. Baranski portrays a plastic surgery-loving party girl in her 40s who is bossy and boozy.

The musical features 22 ABBA songs, including "Dancing Queen," "Take a Chance on Me" and "The Winner Takes It All." Mamma Mia! starts shooting from June-October in London and Greece.

Mamma Mia! was released July 18th, 2008 and stars Amanda Seyfried, Stellan Skarsgård, Pierce Brosnan, Nancy Baldwin, Colin Firth, Heather Emmanuel, Colin Davis, Rachel McDowall. The film is directed by Phyllida Lloyd.