Rebel Wilson is naming names.

One week after teasing the “massive a–hole” she writes about in her upcoming memoir, “Rebel Rising,” the actress revealed the celeb in question to be Sacha Baron Cohen.

“I wrote about an a–hole in my book. Now, said a–hole is trying to threaten me,” the “Pitch Perfect” star claimed in a since-deleted Instagram Story over the weekend.

“He’s hired a crisis PR manager and lawyers,” she went on to allege. “He is trying to stop press coming out about my book. But the book WILL come out, and you will all know the truth.”

Wilson, 44, subsequently named her “Grimsby” co-star in an effort to “not be bullied or silenced by high priced lawyers or PR crisis managers.”

She wrote, “The ‘a–hole’ that I am talking about in ONE CHAPTER of my book is: Sacha Baron Cohen.”

However, a spokesperson for Cohen tells Page Six, “While we appreciate the importance of speaking out, these demonstrably false claims are directly contradicted by extensive detailed evidence, including contemporaneous documents, film footage and eyewitness accounts from those present before, during and after the production of ‘Grimsby.’”

In Wilson’s initial March 15 Instagram video about her book, she kept the mystery A-lister’s name under wraps.

“When I first came to Hollywood, people were like, yeah, ‘I have a no a–hole policy.’ [It] means, like, ‘Yeah, I don’t work with a–holes.’ I was like, ‘Oh, yeah.’ I mean, that sounds sensible or logical,” she said at the time.

“But then [what they meant] really sunk in because I worked with a massive a–hole,” Wilson continued. “And yeah, now I definitely have a no a–holes policy.”

She and Cohen, 52, worked together on “Grimsby,” in which the duo’s characters were boyfriend and girlfriend.

Wilson spoke about the project on the “Kyle and Jackie O” radio show in 2014, calling Cohen “outrageous.”

“Every single day he’s like, ‘Rebel, can you just go naked in this scene?’ And I’m like, ‘No!’” she claimed at the time. “Sacha and I have the same agent in America and I’m like, ‘Sacha, I’m going to call our agent, Sharon, and tell her how much you are harassing me.’”

She added that when they worked together for one “Borat” scene, Cohen allegedly asked her to “stick [her] finger up [his] butt” despite that “really funny bit” not being in the script.

Wilson announced in 2023 that her memoir was on the way, with the book due to hit shelves April 2.