The three main stars of "Fifty Shades of Grey" have finally been cast. Dakota Johnson, Luke Grimes and Jamie Dornan will officially play the parts of Anastasia Steele, Elliot Grey and Christian Grey, respectively. Now, there's only one more part that needs casting, namely Kate Kavanagh.

By the looks of it, the production studio is having a difficult time looking for the perfect Kate Kavanagh. Reports claim that production which was originally scheduled for November has been pushed back to December. Well, everyone can blame "Sons of Anarchy" star Charlie Hunnam for dropping out of the film 3 weeks ago. Of course, if not for Hunnam dropping out, then the sexy Calvin Klein model, Jamie Dornan, would not have replaced him.

While the main characters have been cast, there is one other lead part that needs filling out, namely that of Kate Kavanagh. Kate plays a vital role in E.L. James' erotica series. Thanks to the blonde bombshell, Christian and Ana meet. Plus, Kate is also set to give a few romance moves of her own on Christian's brother, Elliot Grey. Elliot is set to be brought to life onscreen by "True Blood's" Luke Grimes. The announcement was made over the weekend.

"Get ready to be swept off your feet," tweeted author E.L. James. "Welcome Luke Grimes to #TeamFifty as Elliot Grey!," she added.

So far, there is no update as to who would be playing opposite Luke as Kate Kavanagh. The only update made early today was that production would be pushed back to December. Filming is set to begin by Dec 2 which, hopefully, won't affect the big screen release of "Fifty Shades" by Aug 1, 2014.

As for the lead stars, Jamie Dornan was last seen out and about in London enjoying time with his pregnant wife, Amelia Warner. The lovebirds had wed early in April this year.

It will certainly take a while before E.L. James' tweets all about who successfully nabs the part of Kate Kavanagh. For now, fans are desperately hoping fan favourites, Blake Lively, Amber Heard or Diana Agron nab the part. Keep those fingers crossed.

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