Hopelessly devoted to ... hockey?

Olivia Newton-John is set to co-star in a movie musical about Canada's favorite pastime.

The "Grease" and "Xanadu" star will play the mother of a teen hockey phenom in "Score: A Hockey Musical," which begins shooting in Toronto next week.

Director Michael McGowan, whose screen credits include "One Week" and "Saint Ralph," says he managed to land the pop singer-turned-actress by sending her the script through a network of friends.

She was the one that he wanted, but McGowan said Thursday he never imagined Newton-John would accept the role.

Newton-John will co-write and perform a song for the film's final credits, along with Canadian singer-songwriter Marc Jordan, who plays the hockey dad.

The movie is set to be released Oct. 22.

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