James Mcavoy felt awkward and uncomfortable when he had to film a saucy scene with his real life sister for new movie Filth. The Atonement star plays the lead role in the big screen adaptation of the Irvine Welsh book, and his younger sister, Joy, has a brief cameo in which she appears opposite her elder brother in a racy sequence. McAvoy admits he felt "weird" acting inappropriately with his sibling. He says, "Not in my wildest dreams did I think my sister and I would be doing the same job, let alone sharing a screen, let alone me sexually harassing her. Thankfully, I didn't have to kiss her, or touch her or anything like that. But it was a wee (little) bit weird. It was only hard because I couldn't stop laughing. I was the one doing the bad stuff. I was like, 'Yeuch!'" Joy has previously said of her brother's influence, "My brother is a great role model. He encourages me to follow my dreams - it has certainly worked out for him."