Dear Twilight fans,

"Fifty Shades of Grey" author E.L. James is coming to Comic-Con International this summer.

She will be signing her multimillion-selling erotic "Fifty Shades" trilogy on July 12 at the San Diego Convention Center, according to ABC News. The event will be free.

The British author said she was compelled to write her books after the success of "The Twilight Saga."

"I was inspired by Stephanie Meyer. She just flipped this switch," James said in an interview with "20/20" co-anchor Elizabeth Vargas, which aired on Tuesday's "Good Morning America," according to Access Hollywood.

She said that the book has all her fantasies tied up "in one thing."

James started writing "Fifty Shades of Grey" as "Twilight" fan fiction on her website. The story was titled "Master of the Universe," which turned into a series starring a powerful CEO and a young woman in a sadomasochistic sexual relationship. Vintage, a Random House Imprint, acquired the books, which have sold 15 million copies in less than three months, according to the Wall Street Journal.

What does Twilight Saga author Stephanie Meyer think about the New York Times bestseller that has stormed the bookshelves?

"I haven't read it. I mean, that's really not my genre, not my thing," Meyer told MTV. "I've heard about it; I haven't really gotten into it that much. Good on her - she's doing well. That's great!"

And Meyer gave James credit for her creativity, even though the whole trilogy and two main characters Christian Grey and Anastasia Steele are based on the story of Twilight characters Edward Cullen and Bella Swan.

"It might not exist in the exact form that it's in," Meyer said. "Obviously, [James] had a story in her, and so it would've come out in some other way."

Fifty Shades of Grey might be moving to the big screen too, just like Twilight.

Reported by media in March, Universal and Focus Features took movie rights to the steamy book series.

James told The Daily Record (UK) that she is shy despite what she writes about."I put it out there quietly, I had a pen name, I thought I would carry on working in TV and just write this stuff on the side. Who would have thought a racy ­romance would be a No1 ­bestseller?"