Dolly Parton slept as little as 3 hours, did her own hair and makeup on set, co-star Danica McKellar says

Dolly Parton's former co-star, Danica McKellar, is sharing who the country music legend really was when the cameras weren't rolling.

During an interview with Fox News Digital, McKellar said that Parton told her that she would only sleep three to five hours a night and then wake up and do her own hair and make-up.

"She told me she only slept three to five hours a night.

She was always dreaming stuff up and just busy.

She'd sleep on her big travel bus, if she was traveling and doing things, and wake up early in the morning...

She did her own hair and makeup, her own wig and her own makeup.

And she'd get to work," McKellar said.

McKellar's professional relationship with Parton began through Parton's Imagination Library, which included McKellar’s children’s book, "Goodnight, Numbers," in its literacy program.

DOLLY PARTON'S LIFE IN HER OWN WORDS: FROM SMOKY MOUNTAINS POVERTY TO COUNTRY MUSIC IMMORTALITY McKellar later narrated the documentary "The Library That Dolly Built" before pitching the idea for the 2019 Hallmark movie "Christmas at Dollywood," in which she starred opposite Parton.

While working with Parton, McKellar told Fox News Digital that the "9 to 5" singer was "everything that you hope she could possibly be and much more." "She's incredible, great work ethic.

She wanted to rehearse a lot and I was like, 'I would love to rehearse with you.' I'd love to just be in her presence.

She was incredible.

She walked on the set and made everyone feel comfortable because people were so nervous to meet Dolly Parton." "And she just walked on this set and said, 'Merry Christmas everybody.' Like to the whole room and everyone just was charmed, like that was it," she said.

WATCH: Dolly Parton slept just 3 hours and did her own hair and makeup, co-star recalls GET ENTERTAINMENT SCOOP DELIVERED RIGHT TO YOUR EMAIL BY CLICKING HERE WATCH: Dolly Parton charmed everyone on set with one simple Christmas greeting, co-star says LIKE WHAT YOU'RE READING? CLICK HERE FOR MORE ENTERTAINMENT NEWS Parton died Aug.