Robert Pattinson and Kristen Stewart may be bringing their vampire love and sex scenes into "Fifty Shades of Grey."

The "Twilight" co-stars and off-screen lovebirds are viewed one of the sexiest couples in Hollywood.

Stewart, who managed to win back the heart of Pattinson after her cheating scandal with married director Rupert Sanders, is now rumored to be starring in the movie adaptation of E.L. James' erotic romance.

Kristen Stewart may play Anastasia Steele in "Fifty Shades of Grey," a new rumor surfaced, according to The Stir.

"Twilight" director Bill Condon's partner, Jack Morrissey has been reportedly exchanging Twitter messages with Fifty Shades screenplay writer Kelly Marcel.

If Condon ends up producing the trilogy, he may team up with Kristen again, the report claims.

Condon loves Stewart so much that he may not consider any other actress for the role, Celeb Dirty Laundry said.

If Kristen is playing Anastasia, Robsten fans would certainly want to see Rob in the place of Christian Grey.
Because the couple is shy of showing off PDA, the idea of Stewart and Pattinson playing a steamy couple with extreme sexual activities is just so priceless. 

However, the author may not allow the dream casting.

While the characters in "Fifty Shades of Grey" were based off of Edward and Bella in Twilight, and the story developed from a Twilight fan fiction, E.L. James said that the characters became very different.

“I think [casting Robert Pattinson and Kristen Stewart] would be too strange,” James said in an interview. “It would just be… ugh… weird!”

“The characters grew… the cast [in my book] started that way and developed completely into their own people. It was fascinating getting to know them and connect with them very well. I didn’t see an outline straight away… and had no idea where this novel trilogy was going to go. I just went with them," she explained.

Since the announcement of "Fifty Shades" film adaptation in 2012, rumor mill for the potential actors for the main characters has been spinning nonstop.

Rumored actresses for Anastasia Steele include Mila Kunis, Emma Roberts, Katherine McPhee, Emilia Clarke, Alexis Bledel, and Shailene Woodley.

Candidates for Christian include Joseph Morgan, Ian Somerhalder, Matt Bomer, Ryan Gosling and Henry Cavill.