• Rebel Wilson is staying firm on her claims
  • She is going strong against Sacha Baron Cohen
  • Wilson alleges he tried to stop her memoir

With fans rallying around her, Wilson vows to fight back and ensure her story is told. The celebrity world is abuzz – what does her book reveal about their shared past? Rebel Wilson didn't mince words. On Tuesday, the 'Pitch Perfect' star — once again — called out "a—hole" Sacha Baron Cohen for allegedly threatening her over the release of her forthcoming memoir, 'Rebel Rising.'

Rebel is fighting a big enemy

"Thanks so much to everyone who has sent gorgeous memories of support in the last few days and to those who shared with me their stories of this a–hole!" she wrote via her Instagram Story.

"Don't worry I won't be bullied or threatened by this guy!" the actress added. "And am working hard behind the scenes to make sure my book comes out."

Despite her now-public feud with the 'Borat' star, the 44-year-old assured fans that he is only briefly mentioned in the book.

"PS my book is not ABOUT this guy – this is one chapter!"

However, it’s unclear exactly what she wrote about Cohen, whom she worked with on the 2016 comedy film "The Brothers Grimsby."

Wilson's post came after the 52-year-old vehemently denied the actress' claim that he was trying to prevent her book from hitting shelves.

"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,'" a rep for Cohen told 'Page Six' on Monday.

Wilson first alluded to having worked with a massive A-list "a–hole" in a March 15 Instagram video promoting her memoir.

In the clip, the actress joked that she implemented a "no a—hole policy" after working with a then-unnamed Hollywood star.

Although she initially kept Cohen’s identity a secret, the "Senior Year" star outed him as the celebrity in question after he allegedly "hired a crisis PR manager and lawyers" to "stop press coming out" about her book.

"I wrote about an a–hole in my book. Now, said a–hole is trying to threaten me," she alleged via her Instagram Story over the weekend.

"The 'a–hole' that I am talking about in ONE CHAPTER of my book is: Sacha Baron Cohen," she admitted.

Also interesting:

Wilson told her followers that she decided to bring the issue online to prove she won’t "be bullied or silenced by high priced lawyers or PR crisis managers."

'Rebel Rising' is currently set to hit bookstores on April 2.