The truth will out.
Jason Isaacs’ “White Lotus” costars have revealed whether he wore a prosthetic penis for his full-frontal nude scene during Episode 4 of the show’s third season, titled, “Hide or Seek.”
“That wasn’t his real penis,” said Isaacs’ onscreen son Sam Nivola (Lachlan), during a recent interview with TV Insider.
“It was a prosthetic,” confirmed Sarah Catherine Hook, 29, who plays the “Harry Potter” star’s daughter Piper.
“It was really funny. He was very excited to do it. I think he took pride in the prosthetic,” she added, laughing.
“He’s like, ‘It’s my fake d–k scene today!’” Nivola, 21, recalled Isaacs, 61, saying during production.
In the scene, “The Patriot” actor’s robe falls open while he’s strung out on Lorazepam he stole from his wife (Parker Posey).
The revealing moment was “a big deal” for Isaacs, Hook said. “He gave that guy a nice shot — several times!” she remembered, seemingly referring to a cameraperson.
“He sure did!” Nivola seconded.
The Post has reached out to HBO and representatives for Isaacs for comment.
Isaacs, who plays the imperiled family patriarch Timothy Ratlif, recently spoke about his full-frontal nude scene in an interview with Entertainment Weekly.
“Yeah, it is now in my contract for every show I do, so we’ll see,” he joked. “It’ll get easier, hopefully.”
Isaacs wasn’t the only actor to show skin in the first few episodes of “The White Lotus” Season 3.
Patrick Schwarzenegger, who plays Isaacs’ sex-obsessed son Saxon, had a nude scene of his own in the Season 3 premiere.
During EW’s conversation about his onscreen father’s nudity, thirty-one-year-old Schwarzenegger chimed in, “You should be asking what it was like for us to watch it!”
Speaking about future episodes of the series, Isaacs hinted that his character will have an explosive unravelling.
“There is a point coming when they leave — if they make it and they’re alive, because who knows — but it’s going to be unavoidable, the big secret he has been harboring,” he explained.
“I just remember thinking, ‘I’ve got to go big — go big or go home.’ And then when things happen that I can’t talk about particularly, something else had to kick in, and there’s a mania and a terror that you have to access … there was some inner gear changes required.”
“The White Lotus” is currently airing Sundays at 9 p.m. EST on HBO and Max.
