Natalie Portman has revealed that she used a body double for a fully nude scene in new movie 'Goya's Ghost'.

And the actress has a stern warning for anyone intending to crop her face onto someone else�s naked body after the release of the upcoming film.

According to the NY Daily News, the actress tells Jeanne Wolf of Movies.com: "There's a long shot of a nude woman."

"It's not me...You do see some parts of me unclothed, but if they end up on Web sites making it look like I'm nude, I'm going to be really, really angry."