EL James's erotic novel about a sadomasochistic romance between a college student and a businessman has sold more than 40 million copies worldwide.
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Harry Potter author Rowling has now revealed to The Guardian that she has no plans to read Fifty Shades of Grey.
"I promised my editor I wouldn't," she told the newspaper.
Rowling was also quizzed on if she feels left out by the Fifty Shades of Grey trend, to which she answered: "Not wildly."
Rowling's own upcoming novel The Casual Vacancy is her first since the success of the Harry Potter series.
The Casual Vacancy is released on September 27 in the US and the UK.
