Mamma Mia! is a fun romantic movie that you might not expect to be as good as it is. For those who don't like musicals, beware, this movie is a musical, but one that you may very well like if you like romance comedies. Mamma Mia is about a young woman named Sophie Sheridan who is about to get married. Before her wedding she reads her mother's diary and finds out that her father is one of three possible men.