"Fifty Shades of Grey" has become the bestselling British book of all time.
The first book in E.L. James' erotic novel trilogy has sold more than 5.3 million copies, according to figures released today by its publisher, Random House.
The second and third installments of the phenomenon - "Fifty Shades Darker" and "Fifty Shades Freed" - have sold around 3.6 million and 3.2 million copies respectively.
E.L James' FIFTY SHADES OF GREY becomes the bestselling British book of all time! The trilogy has sold over 12 million copies nationwide.
Ms James said the news was "totally unexpected" as she had "no idea they would be so successful".
– 'Fifty Shades' author E.L. James
My main ambition when I signed the deal with Random House was to see my books in the shops.
The whole process has been both extraordinary and rewarding. I couldn't be more pleased with the sales and would like to thank everyone involved.
The book has become a global success and the trilogy is being published in a variety of languages, including Albanian, Chinese, Russian, Serbian and Vietnamese.
"Fifty Shades" is also set to hit the big screen as part of a movie franchise.