The 23-year-old beauty explained: "There are scripts I pick up and say, 'There's no reason why she's taking her clothes off, that's just stupid, it's just nudity for the sake of nudity.' That I do not agree with, ever.
"But when the nudity is warranted, I don't think there's anything shameful in that. If it's justified and the character would do it, then it should be there."
Robbie insists she never had an embarrassing teenage crush on her co-star, who rose to fame in romantic blockbuster Titanic and the film re-imagining of Shakespeare's Romeo and Juliet, and was actually more interested in the film's doomed namesake than the hunky lead actor.
She laughed: "I was absolutely obsessed with the Titanic - not the film, the actual boat.
"I'd draw diagrams about it and theorise that if it was built in a different way, it wouldn't have sunk."
- Bang! Showbiz