Nicole Kidman is ''not shy'' about urinating on camera.

The actress famously had a scene in 'The Paperboy' where her character pees on Zac Efron, but she found it easier to film than singing in 'Moulin Rouge!'.

She told The Hollywood Reporter: ''I just don't find urination shocking. I think I peed in the beginning of 'Eyes Wide Shut', too. But then, I don't find a lot of things shocking.

''Violence is a lot more shocking than sex - sex is primal. [Director] Lee Daniels had an obsession about shooting me from behind - he was obsessed with my ass.

To me, that was so funny. He's hilarious, I love him. I'm drawn to Lee for his wild nature. I felt shy singing in 'Moulin Rouge!' But peeing - no, not shy.''

Nicole, 45, also said she likes the fact the quality and production of TV in the US has gone up so much there are no loner clear lines between stars of the small screen and the big screen.

She said: ''I actually don't even know what a movie star is now - what is a movie star? When the best female part of the year is Claire Danes in [TV series] 'Homeland', you know the game's changed.

''Maybe in the 50s, there was a far more particular idea for a movie star. But now that's all blurry - everything's more fluid.''