Tell her about the movie's content.

You sit her down. "Ms. Portman.. Natalie, there's something you should know about this movie. I dont know if your agent has told you but it does require some explicit scenes."

Natalie looks uncomfortable. "I do have a no nudity clause, you know."

You sense you're losing her. "Well you're here so I can determine whether or not you're willing to do what it takes to get this role. It is a great movie, but it's going to require nudity... and quite a bit more, I'm afraid."

Natalie gets up. "Well, I'm sticking to my rules. Besides I don't care to see exactly how you plan to... find out what I'm willing to do, as you put it." She rises and heads for the door.