The 37-year-old actress has apparently been reading the novel after being introduced to it while shooting her new film in the United Kingdom, reported Contactmusic.
"Angelina kept hearing about the book while she was in the UK. All the girls on set were talking about it and how it's being made into a film.
"Angelina went out and bought herself a copy, thinking she'd love a part in the hot topic on everyone's lips at the moment. She knows the film is bound to be a huge hit," a source said.
The fictional story by E L James tells the tale of college girl slowly consumed by the charms of a man named Christian Grey.