ONE might think that actors film all their own scenes – even the raunchy ones – but you would be mistaken.

Laura Grady is a respected body double that has worked amongst the great and the good in Hollywood for decades.

The actor opened up on what life is really like behind the scenes on these glittering movies.

Speaking to Vulture, she opened up on filling in for Dame Helena Bonham Carter in Fight Club.

The former The Crown actress starred in the hit flick alongside the likes of Brad Pitt, Edward Norton and Jared Leto.

She says the scenes in the film were so “intricate”, that she considered them to be “hard-core” to shoot.

“All those scenes — it was the most intricate sex scene I’ve ever done in my life. And it was pretty hard-core,” Laura explained.

“We were all over each other, me and the body double. He wanted us to choreograph it, like a dance.”

Although Laura did catch glimpses of the superstar actors on the set, she also says that they couldn’t interact as they were all working to busy schedules.

She remarked: “There was also a body double for Brad Pitt, so we spent two weeks with David Fincher on a set and green-screen, just reenacting all of those sex scenes.

“I did see Brad Pitt and Helena Bonham Carter throughout the day, but they were never in my scenes — the body doubles did their thing, and then Brad and Helena did their thing.

“So I never got to interact with Brad, unfortunately.”

The model also explained that there is a misconception around working on sex scenes, because often it’s a timing issue not necessarily involving feelings.

She explained: “Sometimes they don’t have time to do a B-camera roll or something like that. It’s not always that the actress isn’t comfortable.”

Other huge movies she has worked in include Coyote Ugly, where she was the body-double for Piper Perabo in a sex scene with Adam Garcia.

Other huge stars she has filled in for also include the likes of Robin Wright in State of Play and also Patricia Arquette in Human Nature.

However, she says her must ‘fun’ moment on set came with British star Jason Statham on Crank.

“Jason Statham made me feel so comfortable”, she remembered.

“I remember telling my husband later — something so charming, like, ‘Don’t worry about it, I got ya, love.’ He didn’t make me feel stupid or naked.

“And I had to be completely topless, and it was this crazy scene outside with all these background actors.

She added: “But I was like, ‘This is not a bad day. I’m taking my clothes off for Jason Statham. I’ll be okay today.’

“I remember getting the call for Crank 2; Amy Smart requested me and I thought that was really nice.”