"Fifty Shades of Grey" author E.L. James took to her Twitter account to reveal that Charlie Hunnam and Dakota Johnson have bagged the lead roles in the movie adaptation of the erotic novel.

There was a lot of heat about the casting for the movie adaptation of E.L James' blockbuster erotic novel "Fifty Shades of Grey." Many actors and actresses were speculated for the lead roles of Christian Grey and Anastasia Steele in the film.

However, James took everyone by surprise when she revealed the names of the cast. The author took to her Twitter account Monday to reveal that Charlie Hunnam and Dakota Johnson have bagged the lead roles in the movie adaptation of the erotic novel.

"I am delighted to let you know that the lovely Dakota Johnson has agreed to be our Anastasia in the film adaptation of Fifty Shades of Grey." A few minutes later, the novelist added: "The gorgeous and talented Charlie Hunnam will be Christian Grey in the film adaptation of Fifty Shades of Grey."

Dakota Johnson, the daughter of Don Johnson and Melanie Griffith and the granddaughter of Hitchcock star Tippi Hedren, was tipped for the role of Anastasia by Entertainment Weekly last month. Earlier, the US magazine also reported that the Sons of Anarchy star, Charlie Hunnam, bagged the role of kinky billionaire- business magnate Christian Grey. He has then denied the rumor.

Johnson is best known for small roles in Oscar-winning movie 'The Social Network'. She also earned great fame for her role in the comic flick 'The Five Year Engagement' where she portrays an energetic young woman with a high sex drive.

Hunnam, who made his name in the cult U.S. TV show 'Sons of Anarchy', is riding high after strong reviews and decent global box office returns for Guillermo Del Toro's sci-fi action movie 'Pacific Rim'.