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EL James, the best-selling author of the Fifty Shades of Grey trilogy, has debuted at No 1 on the list of Forbes' highest paid authors of 2013. The London-born writer earned £60m ($95m) between June 2012 and June 2013.

The 50-year-old writer, born Erika Mitchell, is known for the series - Fifty Shades of Grey (2011), Fifty Shades Darker (2012) and Fifty Shades Freed (2012). According to Forbes, more than 70 million copies sold during the first eight months in the US. Forbes notes: "The e-book format was a key factor, giving readers an easy way to purchase the sex-filled sequels -- and a discreet way to read them in public."

James has only written only three books (the Fifty Shades trilogy) so far but is reportedly penning her next novel. A film based on the Fifty Shades of Grey story is expected to be released in August next year.

James is followed by American thriller author James Patterson with earnings of £58m ($91m). Patterson is best known for his Alex Cross series.

Other prominent female authors on Forbes' list include Danielle Steel, Suzanne Collins, Janet Evanovich and Nora Roberts. Among the men, Dan Brown, Patterson and Stephen King are in the top ten.

Forbes determines the top earning authors on the basis of its estimates on sales data, published figures and information from industry sources between June 2012 and June 2013. Click on Start to know the top ten highest-paid authors of 2013.

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