Here's which actors passed on the 'Fifty Shades of Grey' lead roles 

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"Fifty Shades of Grey" may have dominated the box office this weekend, but it wasn\'t exactly easy adapting E.L. James\' best selling novel for the big screen.

While Dakota Johnson and Jamie Dornan ended up playing Anastasia Steele and Christian Grey, respectively, finding the right chemistry between two actors with available schedules proved fairly difficult.

Ian Gavan/Getty Images Dakota Johnson and Jamie Dornan landed the coveted roles of Anastasia Steele and Christian Grey. Initially, "Sons of Anarchy" actor Charlie Hunnam was cast as Christian Grey, but many fans of the book didn\'t approve of the choice.

Dimitrios Kambouris / Getty Images Actor Charlie Hunnam dropped out of "Fifty Shades" after being cast. A  petition to re-cast the movie garnered 20,000 signatures on Change.org, and due to scheduling conflicts  and  reported clashes between Hunnam and Universal Pictures, Hunnam eventually dropped out of the project.

Just 11 days later, "Once Upon A Time" actor Jamie Dornan was cast in the role.

Chuck Zlotnick/Universal Pictures and Focus Features Jamie Dornan in "Fifty Shades" Amid all of the casting back-and-forth,  the film\'s producer Dana  Brunetti  tweeted  somewhat of an explanation :

"There is a lot that goes into casting that isn\'t just looks. Talent, availability, their desire to do it, chemistry with other actor, etc … So if your favorite wasn\'t cast, then it is most likely due to something on that list. Keep that in mind while hating and keep perspective."

Brunetti was apparently hinting at the handful of actors who actually turned down the leading roles.

While "50 Shades" author E.L. James has said actor  Ryan Gosling  was the original prototype for Christian Grey, he doesn\'t do sequels.

REUTERS/Yves Herman "50 Shades" author E.L. James has said actor Ryan Gosling was the original prototype for Christian Grey Before Hunnam got the gig, Garrett Hedlund reportedly turned it down.

"Hedlund  was heavily courted by Universal, but the \'Tron: Legacy\' star passed in July because he couldn\'t connect with the character," according to  The Hollywood Reporter .

Frazer Harrison/Getty Images Garrett Hedlund Backing for "White Collar" actor Matt Bomer was so strong that a  petition started by fans  to cast him garnered almost 100,000 signatures.

Getty Images / Frazer Harrison Fan favorite Matt Bomer Other actors in the mix included "Magic Mike" star Alex Pettyfer, who auditioned for the role,  " Gossip Girl" actor   Chace Crawford, who publicly stated he would "love the challenge" of the role, A lexander Skarsgård said on "A ccess Hollywood " he was "born to play" Christian Grey,  and  " The Vampire Diaries" star,

Ian Somerhalder, told Ryan Seacrest that being cast "would be an incredible thing. Hopefully that could pan out."

Fans had their own casting ideas, pushing for Somerhalder as Christian Grey and Alexis Bledel to play Anastasia Steele, in a fan-created mashup trailer that received over a million views.

The role of Anastasia Steele was also a tricky one to cast.

According to Newsweek, "\'Pretty Little Liars\' star Lucy Hale auditioned, as did \'The Carrie Diaries’\' Chloe Bridges, but neither was quite prepared to tackle the subject matter. Hale said the audition made her \'uncomfortable.\'"

Mireya Acierto/Getty Images Actress Lucy Hale Bridges, meanwhile, told Cosmopolitan the role was too risqué.

"The scene was, like, the girl telling her friends about some sexcapade she had," explained Bridges. "But it goes into extreme detail and uses the word \'sperm\' a couple times. I was like, \'I don’t know, guys, I have to go home to my grandparent’s house in a few months at Christmas, I don’t know if I can do this.\'"

John Sciulli/Getty Images Actress Chloe Bridges Despite early rumors that Emma Watson was being considered, the "Harry Potter" actress tweeted:

And so, the role went to Melanie Griffith and Don Johnson\'s 25-year-old daughter, Dakota Johnson, who had previously only appeared in minor but memorable roles in "21 Jump Street" and "The Social Network."

Whether "Fifty Shades" fans agreed with the Dakota Johnson and Jamie Dornan casting or not, they clearly have star power as the duo pulled in a record-breaking   $266 million worldwide  over President\'s Day weekend.

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