EL James's popular erotic Fifty Shades Of Grey trilogy hit its 100 millionth sale worldwide this week (begs24Mar14), making it one of the bestselling series of all time.

By achieving the milestone, this puts the series level with Ian Fleming's James Bond series, which was first published more than 50 years ago, while James' book only debuted in 2011.

The trilogy, which also includes Fifty Shades Darker and Fifty Shades Freed, has been published in 51 languages and is the fastest-selling book series in the history of Random House, the world's largest publisher.

However, Fifty Shades of Grey still has a long way to go to catch up with series such as Stephanie Meyer's Twilight (120 million) and Dan Brown's The DaVinci Code (200 million).

At the top of the list is J.K. Rowling's beloved wizard Harry Potter, as the seven-book series has sold more than 450 million books globally.

The film adaptation of Fifty Shades of Grey, starring Jamie Dornan and Dakota Johnson, is currently in production and slated to hit cinemas in February, 2015.