"Fifty Shades of Grey" trilogy sales reach 100 million

"Fifty Shades of Grey" has joined the 100 million club.

Vintage Books announced Wednesday that sales for E L James' sexually explicit trilogy have reached 100 million copies and have spent 100 weeks on The New York Times' paperback best-seller list. The novels have been translated into 51 languages, including Hebrew, Icelandic and Korean. With a film adaptation planned for 2015 -- starring Jamie Dornan as Christian Grey and Dakota Johnson as Anastasia Steele -- many more sales are likely.

The author took to Twitter to thank fans after reaching the milestone.

James' books, which originated as fan fiction inspired by Stephenie Meyer's "Twilight" books, immediately topped best-seller lists after Vintage acquired them in 2012. Vintage is an imprint of Penguin Random House.