It's all in the family when RUMER WILLIS guest stars on "Miss Guided," ABC's comedy series produced by Rumer's step-dad, ASHTON KUTCHER.

"I've never done TV," Rumer tells ET, "but when Ashton was working on it, I heard about it and thought that was a cool idea. I never went to 'high school high school,' so the opportunity to do stuff like that is so much fun."

In this episode, Rumer plays a rebellious student who gets six months' detention for pulling a fire alarm.

"The counselor (JUDY GREER) is asking me why I did it and if I am having troubles at home. Is it a cry for help?" Rumer tells ET. "I am not wanting to hear it, so I disregard her, but promise I will never do it again. Two seconds later someone pulls the fire alarm again."

Rumer's "Frenemies" episode of "Miss Guided" airs Thursday, April 3 at 8:30 p.m. on ABC.