Dakota Johnson and Charlie Hunnam cast as Fifty Shades of Gray lovers

Melanie Griffith's actress daughter Dakota Johnson will romance Charlie Hunnam in the upcoming film adaptation of erotic bestseller Fifty Shades Of Gray.

Author E.L. James announced the big news on Monday (02Sep13), revealing The Social Network star, whose father is Miami Vice veteran Don Johnson, had been chosen to portray adventurous college student Anastasia Steele on the big screen.

Taking to her Twitter.com blog, James wrote, "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 Gray."

Minutes later, she added, "The gorgeous and talented Charlie Hunnam will be Christian Gray in the film adaptation of Fifty Shades of Gray."

Johnson's casting comes just days after she was tipped for the role, ahead of the likes of Emma Watson, Kate Beckinsale and Alexis Bledel, while Sons of Anarchy star Hunnam also recently emerged as the hot favorite to play masochistic billionaire Gray.

British filmmaker Sam Taylor-Johnson will direct the movie.