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"Knots Landing" star Donna Mills is revealing the one unexpected request she refuses to fulfill for her OnlyFans subscribers.

During a Friday appearance on ABC's " Nightline ," the 85-year-old actress told correspondent Kayna Whitworth that her content largely consists of glimpses into her daily life but asserted that there is one routine she won’t perform for the camera.

"I do the Peloton," Mills said. "Just, you know, they’re the things of everyday life: having a cup of coffee, you know. They say they like it when you brush your teeth…I’m not going to brush my teeth."

Donna Mills revealed the one OnlyFans request that she won't fulfill. (Disney via Getty Images)

DONNA MILLS DOES 100 SIT-UPS A DAY, PLAYS TENNIS FIVE TIMES A WEEK AT 85 BUT WON'T QUIT DORITOS

When asked if she believes that most of the OnlyFans users who are engaging with her are men, Mills said, "I think so. Yeah.…