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Mamma Mia!, a beloved musical film released in 2008, stars both Julie Walters and Meryl Streep. The story revolves around a young woman named Sophie, played by Amanda Seyfried, who invites three potential fathers to her wedding without revealing their identities. Walters portrays Rosie, one of Sophie's bridesmaids and close friends, while Streep takes on the role of Donna, Sophie's free-spirited mother.