By Jon Boon - Breaking Celebrity News Reporter

Despite putting on a brave face at the Lawless premiere last week, Shia LaBeouf’s "method" acting is destroying his relationship with girlfriend Karolyn Pho, Breaking Celebrity News is exclusively reporting.

The 26-year-old actor’s volatile romance with the up-and-coming designer hit the skids after the complex actor agreed to star in Nymphomaniac, the controversial movie by daring Danish filmmaker Lars von Trier.

Shia has confirmed that he is expected to perform a real sex scene in the flick with one of his co-stars and Karolyn isn’t happy with it.

“They’ve been on the rocks ever since Shia agreed to star in Nymphomaniac,” a source close to the couple revealed.

“Karolyn gets that Shia likes to go method and appreciates his artistic integrity. However, she thinks performing a real sex scene in a movie is going too far.

“It’s difficult for her to understand why it can’t be simulated – just like in other films.

“She wants him to do the film, because Shia was desperate to work with Lars – he’s such a hero of his. And she doesn’t mind if he strips off completely – she had no qualms about the Sigur Ros music video. 

“But Karolyn doesn’t want him having sex with somebody else – simple. She’s begged Shia to ask Lars if it’s possible to make the scenes appear real, rather than shoot them real,” the source revealed.