Charlize Theron has joked that working with Michael Fassbender makes her feel uncomfortable.

The Hollywood stars appear in a steamy photoshoot for W magazine, and in several shots the pair pose in sexy leather outfits as they hold each other tightly. Charlize and Michael star in the sci-fi movie Prometheus in which they play bitter rivals. Although they clearly had a great time working together, Charlize was happy to tease Michael about their experiences on set.

"And I've been lucky to work with people I've been really comfortable with. I've had maybe two occasions where..." Charlize told the publication as she recalled the array of stars she has worked with during her career.

"It's been uncomfortable," Michael interjected.

Charlize was quick to finish her sentence, laughing, "And Michael's one of the two who did not make me feel very comfortable."

In Ridley Scott's Prometheus, Charlize plays corporate boss Meredith Vickers, while Michael is android David.

Michael insists his uptight role may not have helped break the ice between the pair.

"I was a robot!" he laughed in his defence.