Jane Fonda Reveals She's Writing a Novel Called 'Amanda's Secrets' (Video)

"Writing a novel scares me," the Oscar winner tells THR. "So I thought, well, I'm going to do it."

Jane Fonda is adding "novelist" to her résumé.

The actress, political activist and philanthropist revealed to The Hollywood Reporter in Cannes that she's writing a novel called Amanda's Secrets.

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"Writing a novel scares me," Fonda said during a sit-down interview at the Martinez Hotel. "I've never done it, so I thought, 'Well, I'm going to do it.'"

Still, Fonda is no stranger to writing: She already has published two best-selling memoirs, 2005's My Life So Far and 2011's Prime Time.

However, Fonda declined to divulge more details, so it's unclear whether she is already working with a publisher or if the novel has a release date.

She added, with a grin: "I'm not going to tell you what [the novel is] about."

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Fonda -- who's in Cannes on behalf of her work as a L'Oreal brand ambassador -- has been busy of late. In addition to writing, she recently signed on to reunite with her 9 to 5 co-star Lily Tomlin in Grace and Frankie, a Netflix comedy series from Friends creator Marta Kauffman.

The single-camera comedy centers on nemeses Grace (Fonda) and Frankie (Tomlin), whose lives are turned upside down when their husbands announce they are in love with each other and plan to get married. The women, much to their own dismay, find that their lives are permanently intertwined and, much to their surprise, they find they have each other.

"The humor will come out of the pain and out of reality," she said. "If we should be so lucky as to be thought of for awards, you don't know quite what category to put it in. I'm so excited."

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Fonda added that she and Tomlin have stayed friends since starring in 1980's 9 to 5 alongside Dolly Parton.

"We're very close and we get along very well," she said.

Fonda also reflected on her first time at the Cannes Film Festival, in 1975, when she was there supporting the movie Coming Home. Watch more from the interview, above.

Fonda, who co-starred last year with Tina Fey in Admission, also appears on Showtime's Web Therapy and continues to perform in 30 to 50 theater concerts across the country each year.