The film - about two ballerinas battling it out for the lead role in `Swan Lake` - contains a particularly graphic scene in which Natalie`s character Nina is caught by her mother pleasuring herself, and she admits it was one of the most uncomfortable things she has ever had to film.

She told MTV News about shooting the scene, describing it as "so disgusting."

Of her discomfort, she added: "It was akin to the experience of watching the movie with my parents sitting next to me, let me tell you!"

The movie also contains a scene where Natalie`s character Nina and her rival Lily - played by Mila Kunis - have a lesbian romp, which Mila has revealed she asked her father not to watch when they attended a screening together.

She said: "He was like, `I don`t think I should see the movie. I was like, `See the movie. There`s going to be a point; get up and leave.`

I don`t think any dad should see. It`s just not necessary."

But Natalie is adamant the sex scenes are not most shocking aspect of the film - which was directed by Darren Aronofsky.

Instead, she claims the `finger scene` - where Nina pulls at a loose piece of skin on her finger, causing it to bleed profusely - is the most difficult to watch.

She added: "The finger moment is pretty ? well it makes my blood curdle."
sections: Celebrities