Amanda Seyfried wore a ‘prosthetic butthole’ for new movie ‘Testament of Ann Lee’

Amanda Seyfried had a “cool” and “exciting” time using a “prosthetic butthole” filming “The Testament of Ann Lee.”

The actress explained on “The Scott Mills Breakfast Show” Wednesday that “this movie … needed to be graphic.”

The Oscar nominee, 40, recalled, “I was pregnant and naked, but I wasn’t naked at all. And at the end of the movie, I’m standing in front of a burning building with just a merkin.”

Seyfried gushed that she “felt so free” wearing only an artificial hair covering in that moment as she portrayed real-life Shakers founder Ann Lee.

At the end of the interview, Seyfried clarified, “You cannot see my butthole in [the scene], but I swear there is a prosthetic butthole there.”

Scott Mills asked, “Why did they have one if we don’t see it?”

Seyfried said it was a “just in case” precaution — and when Mills called her comment a “great way to end an interview,” she began giggling.

“Gotta get people to the theater!” the former soap star exclaimed.

The moment was clipped to the show’s Instagram page, with one follower gushing, “She’s such a weirdo i LOVE her.”

Another fan added, “I think her entire press run for this production should be a movie.”

Seyfried called the film “f–king daunting” in a Who What Wear cover story last year.

“I feel like I have to keep choosing things that terrify me — within reason,” she noted in the December 2025 interview. “I’m not gonna jump off a cliff or jump out of an airplane.”

However, Seyfried said, “I need to sink my teeth into something that is really scary because I know I can do it, and I know I’ll be better for it.”

The “Big Love” alum received a 15-minute standing ovation when the movie premiered at the Venice Film Festival in September 2025.

Seyfried was nominated for an Oscar and a Golden Globe for the role, losing the latter to Rose Byrne — and going viral for grimacing over the loss.

While awaiting the 2026 Academy Awards next month, Seyfried asked the New Yorker why she would she “need [to win] one now?”

She explained in January, “I’ve gotten this far. … Would [an Oscar] be great? Of course it would, for every reason. But it isn’t necessary.”