Singer Justin Bieber and his girlfriend, singer Selena Gomez arrive at the 2011 American Music Awards in Los Angeles November 20, 2011. (Photo : REUTERS/Danny Moloshok)

Fifty Shades of Grey has easily become a cult classic. With the book, written by British author E.L. James, getting a big-screen adaption, there is much hyper over who will be casted as the series' kinky main characters Christian Grey and Anastasia Steele.

The pressure for casting directors is on! Die-hard "Fifty Shades" fans have high expectations for their debonair Christian Grey and submissive Anastasia Steele. Sexy male actors like Alexander Skarsgard, Ian Somerhalder, and Ryan Gosling have all been rumored and suspected of being considered to take on the role. But now, an unlikely heartthrob is in discussions - Justin Bieber.

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The 18-year-old performer spoke out about being tapped to play the young and wealthy sex machine while on ITV's "The Jonathan Ross Show."

 "They actually want me to be in the movie," said Bieber. But just as his fans went crazy with excitement, the singer disappointed all when he revealed he was "just kidding."

While Bieber played around with the idea of joining the cast, his girlfriend Selena Gomez made it clear that she is not interested. The 20-year-old starlet stated that she would turn down the role of Anastasia Steele if she was ever offered it.   "I know I'm taking risks, but I don't think I could do that!" she told MTV News. "That would be a little too much for me. I think someone older should do that part."

Emma Watson, who is two years older than Gomez, is now rumored to be in discussions to play Ms. Steele.