The former Disney star, who has already made a parody video based on E L James' steamy erotic novel of the same name, said taking on the role in the upcoming film adaptation would be a step too far.
"I only read the beginning of it, because when they told me about the skit, I didn't know what it was about. So I started to read it, and I was like, 'Oh, this is spicy.' So I thought it was good, it was intriguing.
"I don't think I would (take on the role). I know I'm taking risks, but I don't think I could do that! That would be a little too much for me. I think someone older should do that part," she said. Recently, 'American Psycho' author Bret Easton Ellis suggested Scarlett Johansson should take on the role and he even offered to write the script.