After months of “Fifty Shades of Grey” movie cast rumors, I was just waiting for a safe word. The producers of the “Fifty Shades of Grey” movie cast Dakota Johnson, the daughter of Don Johnson and Melanie Griffith, in the role of Anastasia Steele. Charlie Hunnam from “Sons of Anarchy” will wield the whip as Christian Grey in “Fifty Shades of Grey.”

The “Fifty Shades of Grey” cast member, Dakota Johnson is best known for her hot scene with Justin Timberlake in "The Social Network." Before Dakota Johnson started acting, the first official “50 Shades of Grey” cast member was a model at IMG. Dakota Johnson is currently shooting a modern-day re-telling of Shakespeare’s “Cymbeline.”

“Fifty Shades of Grey” casting rumors took over the internet all summer. Early "Fifty Shades of Grey" casting rumors included well-known names like Alexis Bledel, Emma Watson and Armie Hammer.

E.L. James The “Fifty Shades of Grey” author took to Twitter to spring the news this morning, she tweeted “I am delighted to let you know that the lovely Dakota Johnson has agreed to be our Anastasia in the film adaptation of Fifty Shades of Grey.”

"Fifty Shades of Grey" sold more than 70 million copies and thrust E.L. James to worldwide fame and wealth. Along with Simon Cowell and Howard Stern, E.L. James is tied for third on Forbes’ top-earning celebrities list for raking in $95 million this year.

"Fifty Shades of Grey" will probably could get an NC-17 or R rating for its sex scenes, though it's unclear how much of the book's racy content will make it to the screen.

Hunnam more recently starred in “Pacific Rim,” which was directed by Guillermo Del Toro. Hunnam, 33, has also appeared in the films "Cold Mountain," "Children of Men" and "The Ledge."

E.L. James tweeted the news about Hunman shortly after, “The gorgeous and talented Charlie Hunnam will be Christian Grey in the film adaptation of Fifty Shades of Grey.”

Fifty Shades of Grey will be directed by Sam Taylor-Johnson, who helmed Nowhere Boy. The screenplay for the movie adaptation of Fifty Shades of Grey” was written by Kelly Marcel, who wrote Saving Mr. Banks.

Focus will release “Fifty Shades of Grey” on Aug. 1, 2014.