True Blood star Luke Grimes has been cast in the Fifty Shades of Grey movie.

The 29-year-old American actor will take on the role of Christian Grey's (Jamie Dornan) brother Elliot in the big-screen adaptation of EL James' novel.

It was announced on Wednesday (October 23) that Northern Irish actor Dornan had replaced recently departed Charlie Hunnam as Christian Grey in the film.

Author James confirmed the news when she tweeted: "Stow your twitchy palms ladies... our man is here. Welcome to #TeamFifty @JamieDornan1 x"

Dakota Johnson is set to play the female lead Anastasia Steele in the movie.

Fifty Shades of Grey is set for an August 2014 release.