KARACHI: Drive star Ryan Gosling is reportedly the favourite, for the highly-coveted lead role in Hollywood’s adaptation of literary sensation “50 Shades of Grey” reported Ladbrokes.

Bookies have jumped on the books current success and joined in the fascination with who might play the characters of Christian Grey and Anastasia Steele in the movie version.

Gosling's odds are 2/1 to play Christian Grey, with Vampire Diaries' Ian Somerhalder next in line at 5/2. German actor Michael Fassbender has odds of 3/1.

Mila Kunis is now the favorite contender to play innocent Anastasia Steele, with odds of 3/1. Scarlett Johansson, who had been hotly tipped for the role, is 4/1, with Elizabeth Olsen (9/2) and Alexis Biedel (5/1) also on the list.

“The nation has gone 50 shades of crazy for the book so it’s impossible to see how the film won’t be a success either," Jessica Bridge of Ladbrokes said. "The odds suggest 50 Shades will cane its competition in the box office.”