Justin Baldoni’s “It Ends With Us” body double is sharing insight into his experience working on the film.

Thomas Canestraro alleged that there was a “tense” atmosphere on the set of Baldoni and Blake Lively’s 2024 movie.

“There was some discomfort from everybody,” he claimed to the Daily Mail in an interview published Sunday.

Canestraro said that he was supposed to be on set in New Jersey for only five days, but due to production issues, he was there for two weeks.

The stunt double further alleged that Lively — who has brought a lawsuit against Baldoni for supposed sexual harassment — was perceived as being “closed off” in the final weeks of filming in early 2024.

He mentioned that while he found it very comfortable working with Lively, who is 37, during the making of “A Simple Favor” in 2018, her demeanor noticeably shifted during the filming of “It Ends With Us.”

Furthermore, Canestraro pointed out that although he found it impressive that Lively’s spouse, Ryan Reynolds, visited the set, he now acknowledges that the appearances by the “Deadpool” actor might have been linked to Lively’s emotional state at the time.

A source close to Lively told TMZ that it shouldn’t be surprising she was “closed off” given the sexual harassment allegations she made against Baldoni, 41.

Canestraro told the Daily Mail that Baldoni, who also directed the film, was “extremely friendly” on the set, but they haven’t stayed in touch.

The Post has reached out to reps for Baldoni and Lively for comment.

“It Ends With Us,” which came out last summer, and is based on a novel by Colleen Hoover, is about a domestic violence relationship between Baldoni and Lively’s characters.

In December, Lively filed a lawsuit alleging that Baldoni sexually harassed her during filming. She also accused him of “a coordinated effort to destroy her reputation” after the movie was released. 

The “Café Society” actress said the alleged smear campaign caused harm to her business and led to her family experiencing “severe emotional distress.”

Baldoni denied the allegations and countersued Lively and Reynolds, 48, for $400 million over alleged defamation and extortion.

In her lawsuit, Lively alleged Baldoni improvised kissing scenes and wanted to add sex scenes to the film. In his countersuit, Baldoni alleged that Lively agreed to shoot their intimate scenes without meeting with an intimacy coordinator beforehand.

The “Jane the Virgin” actor also released raw footage of a dancing scene wherein Lively claimed that Baldoni made her feel uncomfortable. Baldoni denied Lively’s claims and accused the “Gossip Girl” alum of trying to take over the direction of the scene.

Taylor Swift was subpoenaed as a witness by Baldoni’s legal team amid the court battle, but his side dropped the subpoena in a bombshell move late last month. A spokesperson for Lively told The Post they were “pleased that Justin Baldoni and the Wayfarer Parties have withdrawn their harassing subpoenas to Taylor Swift and her law firm.”

“We supported the efforts of Taylor’s team to quash these inappropriate subpoenas directed to her counsel,” they told The Post, “and we will continue to stand up for any third party who is unjustly harassed or threatened in the process.”

“The Baldoni and Wayfarer team have tried to put Taylor Swift, a woman who has been an inspiration for tens of millions across the globe, at the center of this case since day one,” the spokesperson added.

In response to the original subpoena filing, a representative for Swift, 35, said, “Taylor Swift never set foot on the set of this movie, she was not involved in any casting or creative decisions, she did not score the film, she never saw an edit or made any notes on the film, she did not even see ‘It Ends With Us’ until weeks after its public release, and was traveling around the globe during 2023 and 2024 headlining the biggest tour in history.”

Lively and Baldoni’s ongoing legal battle is heading to trial in March 2026.

Lively’s lawyer confirmed she will testify.