|Back in the day...Kristen Stewart and Robert Pattinson|
The actor is still in regular contact with Kristen, despite splitting from his 'Twilight' co-star earlier this year because he was unable to get over her fling with married director Rupert Sanders.
Rob, 27, even asked the 'Snow White and the Huntsman' star whether he should take on the role of Christian Grey in the upcoming adaptation of 'Fifty Shades of Grey.'
After being approached by the production company, he asked for advice from the 23-year-old starlet and she told him she thought it would be a "disaster."
A source told Yahoo! omg!: "Kristen told him 'Fifty Shades' would be a disaster for him.
"He's haunted by 'Twilight' and being too identified with that role, taking 'Fifty Shades...' would mean a worse label for the rest of his career.
"Kristen told him that, creatively, he shouldn't do it, but if it's about fame and money, he should.
"She told him he had to make the choice between the two, but warned that it would stick with him."
Rob split from Kristen, 22, five months ago after four years together and he has recently been spotted on several dates with 22-year-old model Dylan Penn, whose parents are Sean Penn and Robin Wright.
The male lead in 'Fifty Shades of Grey' - which is based on the erotic novel by E.L. James - has reportedly been given to Jamie Dornan.