The Oscar-winning actress opens up about a past on-set nightmare that left her vowing never to collaborate with a certain co-star again.

October 24, 2025: Allison Janney, known for her brilliant performances in Mom and I, Tonya, recently revealed that not all of her Hollywood experiences have been pleasant. The acclaimed actress hinted at a deeply negative encounter with a former co-star — one so bad that she made a personal vow never to work with that person again.

Image Credit: Charles Sykes/Bravo

A Rare Glimpse Into Her Professional Boundaries

During a candid interview, Janney didn’t name the actor but shared that the experience left her emotionally drained. “There are some people who just make the job harder than it needs to be,” she said. “When you’re on a set, respect and collaboration mean everything. Unfortunately, not everyone understands that.”

Fans Speculate Who the Mystery Co-Star Could Be

Her revelation has sparked widespread speculation among fans. Social media users have been trying to guess which past project or co-star she might be referring to, given her extensive career in both film and television. However, Janney maintained her professionalism by refusing to name names, choosing instead to focus on the lesson she learned from the ordeal.

Moving Forward with Positivity

Despite the negative memory, Janney emphasized that the experience made her more selective about the people she works with. “I’ve learned to protect my peace,” she added. “Now I prioritize kindness, respect, and a healthy work environment above all else.”

The Emmy and Oscar winner continues to be one of Hollywood’s most respected and versatile talents, admired for both her integrity and her unmatched screen presence.