Robert Pattinson will star in a movie about '50s actor James Dean, but won't play him.

Robert Pattinson will star in a movie about ’50s actor James Dean, but won’t play him.

Robert Pattinson has often been compared to 50s-era movie star James Dean. Now he’ll star in a new movie “Life,” about Dean and his enduring friendship with Life magazine photographer Dennis Stock. But guess who will be playing Dean, the iconic anti-hero?

It won’t be Rob. He’s slated to play Stock while Dane DeHaan will play Dean, according to The Hollywood Reporter.

Dean became a Hollywood legend, even though he only starred in three films and and appeared uncredited in four other pictures before he died in a car crash in 1955.

Some how the casting just doesn’t seem right, since Rob has the same moody good looks as Dean, while DeHaan is far more boyish.

The film is being produced by Iain Canning and Emile Sherman, who also produced the Oscar-winning “The King’s Speech,” according to The Reporter.

While Rob won’t play the iconic film actor, much of the film’s focus will be on him. The movie will chronicle Stock’s travels with Dean before he became famous in his first major role East of Eden in 1955.

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Dean went on to star in “Rebel Without a Cause” the same year and played a supporting role in “Giant,” opposite Elizabeth Taylor and Rock Hudson. The film was released posthumously in 1956.

Pattinson has been making headlines recently for his appearance in a new commerical campaign for Dior Homme perfume. The first video for the campaign was released Sept. 1.

He recently finished shooting David Cronenberg’s film “Maps to the Stars” and before that “The Rover” in Australia.

DeHaan, 27, is an American actor who is best known for his role as Jesse in the HBO series “In Treatment.” He also starred in the 2012 film “Chronicle,” and had supporting roles in “Lawless” and “The Place Beyond the Pines.”

He’s got two more films indie “Life After Beth,” a comedy about zombies starring Anna Kendrick and Aubrey Plaza and the highly anticipated sequel “The Amazing Spider-Man 2. He also stars in the movie “Kill Your Darlings” with Daniel Radcliffe.

One of his latest films, The Devil’s Knot,” will premiere at the Toronto International Film Festival.

It seems strange that Rob wasn’t cast as Dean, but let us know your thoughts and follow TheImproper on Twitter for all the latest Robert Pattinson updates you can trust.