Fifty Shades of Grey movie cast: Dakota Johnson as Ana Steele and Charlie Hunnam as Christian Grey could be the sex-duo that fans are waiting impatiently to be announced.

The two are front-runners for the Fifty Shades of Grey movie, which is just waiting on an official cast. The success of the book has sparked an immediate need for a film and the readers want to know who will help make the book a reality.

For the Fifty Shades of Grey characters in the movie, Charlie Hunnam would have play someone with a kinky side that has helped the book become a best-seller. Dakota Johnson would have to play the role of a college student that has to interview the sexy billionaire, which leads to a kinky relationship between the two.

Johnson had roles in "The Social Network" and "21 Jump Street," but this could be her biggest role as a main star as a part of the Fifty Shades of Grey movie cast. She would play the lead female role in the trilogy of books that is set to make have three films as well.

In "Sons of Anarchy," Hunnam is the protagonist on the FX television series. He is the President of the Sons of Anarchy Motorcycle Club's Redwood Original (SAMCRO) chapter based in Charming, Calif.

"Hunnam has emerged as producers' prime target to play, and I quote, 'handsome, yet tormented billionaire,' Christian Grey," stated Twitch.

If this duo is indeed the duo, then let the imaginations begin to run wild for what will happen when the cameras are rolling.