Shia LaBeouf's 'Nymphomaniac' co-star has become his girlfriend.

The 'Transformers' actor appears in the two-part erotic drama and he is said to be dating British model-and-actress Mia Goth.

According to The Sun on Sunday, the couple got together after filming wrapped up for the movie, and she isn't interested in a typical glamorous Hollywood love life.

She said: ''I want something very simple. Maybe just stay in and cook and watch a great movie. I'm obsessed with film.''

'Nymphomaniac' is set to cause controversy with its unashamed approach to the intimate scenes, and even Shia admitted he has no idea what the finished piece will be like.

He explained: ''I don't know what it's gonna be. I know [Lars von Trier is] a very dangerous director - I know we're trying to do something different.

''It's not your typical film ... There's a disclaimer at the top of the script that basically says we're doing it for real.

''Everything that is illegal, we'll shoot in blurred images. Other than that, everything is happening.''