EXCLUSIVE: E.L. James on a Possible Fourth 'Fifty Shades' Book: 'There's a Chance'

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E.L. James, the author of the Fifty Shades trilogy, sat down with ET just before Fifty Shades Darker hits theaters next Friday, and she left the door open to the possibility of more shadiness to come!

"There's a chance," James told ET's Cameron Mathison when asked if there might be a fourth book. "But I've got other things I'd like to do. I've written another novel as well."

WATCH: Dakota Johnson Reveals 'Fifty Shades Darker' Has a 'Surprise' Tribute to Mom Melanie Griffith

Of course, the series has become immensely popular, selling more than 100 million copies and claiming fans all over the world, including Taylor Swift.

"She asked if she could use the book in a video, and I thought, 'The book is too famous! I just don't want it to be any more famous, please!" she says.

Swift appears on the Fifty Shades Darker soundtrack and just released the music video for "I Don't Wanna Live Forever" with Zayn Malik last week. The video rivals the movie in sultriness, which James assured us is at an all-time high in the film.

"They brought it 110 percent. It's hot," James said of stars Jamie Dornan and Dakota Johnson. "They're really good sports and they threw themselves into it."

In the movie, Anastasia (Johnson), meets the women who stole Christian's (Dornan) heart before her, who is played by Kim Basinger.

WATCH: Dakota Johnson Turns Fifty Shades Into a Comedy With Jimmy Fallon Portraying Christian Grey

While she's new to the series, Basinger is well-versed in being seductive on screen following her roles in movies like 9 ½ Weeks.

"Such a classy lady," James gushed over the Oscar winner. "She's the ultimate professional."

Fifty Shades Darker opens Feb. 10.