Jamie Dornan has been a trending topic ever since it was announced that he has replaced Charlie Hunnam to play Christian Grey in "Fifty Shades of Grey." Find out what fans have to say.

Until now Jamie Dornan was known only as the hot Calvin Klein model who starred in "Once upon A Time" and "Fall". Now the Irish actor has grabbed headlines for replacing Charlie Hunnam to play Christian Grey in "Fifty Shades of Grey." Dornan's followers have swelled to more than 95,000 on Twitter - adding above 2,000 new followers in a matter of hours, Thursday.

So what do fans have to say? While some are still  disappointed about Matt Bomer or Ian Somerhalder not bagging the role, others have deemed Dornan hot, sexy and kinky enough to play the troubled billionaire.

Lena Dunham, a celebrity follower of the Irish actor took to her twitter account to reveal what a big fan she is.

I'm a monstrous @JamieDornan1 fan. Wasn't allowed to be attracted to him on The Fall bc he played a sexmurderer. 50 Shades is my big chance!

— Lena Dunham (@lenadunham) October 24, 2013

She was not the only one. Many other Dornan followers tweeted about why they thought their favourite star was worthy of the role. Many websites have already published "need to know" articles about the "Marie Antoinette" actor, listing stats about his past work and high-profile romances, which includes a two-year relationship with Oscar-nominated actress Keira Knightley.

Do you think Dornan is fit for the role? Let us know in thecomments below.