The English actor joins Russell Crowe and Hugh Jackman in the big-screen version of the Broadway musical
He can seduce Marilyn Monroe, but can he sing?
Tom Hooper, who picked up an Oscar this year for "The King's Speech," will direct the film from a script by William Nicholson.
Redmayne has had key supporting roles in films such as "The Good Shepherd" and "The Other Boleyn Girl." He also starred in the Starz mini-series "The Pillars of the Earth."
Deadline first reported Redmayne's casting.