Jamie Dornan has complained he doesn't like his body - as he posed topless for the cover of Interview magazine.

The former Calvin Kelin underwear model - who will star as billionaire heartthrob Christian Grey in the Fifty Shades Of Grey movie - showed off his rippling muscles as he posed in a tiny pair of Y-fronts in the bath for the trendy magazine.

But Jamie, 31, told the mag: "I don't like my physique. Who does? I was a skinny guy growing up, and I still feel like that same skinny kid."

The hunky Irish actor insisted he is very different to the hero of EL James' hit erotic novel, Christian Grey.

He said: "I think there was so much more to Christian that we covered - someone who is careful to keep himself in shape, someone who spends obscene amounts of money on presenting himself. A lot of that work was done in the gym and with costume.

"We didn't talk about particulars of the way he would move. But I'm quite awkward in a suit because I don't have an opportunity to wear a suit very often, and this is a guy who lives in a suit - the best suit. That has to have an effect. But when you end up in a suit for 80 per cent of the filming process, you become pretty comfortable with it."

Asked about exposing his body on the big screen for the steamy film, Jamie laughed: "I'm still auditioning.

"I don't really have choices in the material I get. So I have to make the choices in the way I play the characters. And I'm happy to get a chance to play Christian."