Anne Hathaway, joining the “Les Miserables” movie cast. (LUCAS JACKSON/REUTERS)

Anne Hathaway is officially joining the cast of the upcoming movie adaptation of “Les Miserables.”

As confirmed by Deadline — and rumored for several weeks — Hathaway has signed on to play Fantine, the poor and unfairly imprisoned mother who sings one of the musical’s most famous numbers, “I Dreamed a Dream.”

Tom Hooper, director of last year’s Academy Award-winning best picture “The King’s Speech,” is directing the project, which already stars Hugh Jackman in the lead as Jean Valjean and Russell Crowe as Inspector Javert. It’s scheduled for release in December 2012.

Now Hooper just needs to cast the love triangle roles of Cosette, Marius and Eponine. Maybe Lea Michele could play Cosette, daughter of Fantine? There is a slight resemblance between her and Hathaway, and perhaps make-up and some CGI tweaks could widen the age gap between them.

Got other “Les Miz” casting ideas? Share the by posting a comment.