Rebel Wilson has asserted Sacha Nobleman Cohen asked her ‘stick her finger up his a**’ and strip bare during recording for his film, The Siblings Grimsby.

The Australian entertainer, 44, has been making unstable cases about her involvement in the English star, 52, in her new journal, Agitator Rising, marking him an ‘a**hole’.

Rebel has now guaranteed she had an awkward encounter while recording the 2016 parody – claims which Sacha has said are bogus and gone against by proof – and shared subtleties in another passage from her self-portrayal.

She played the role of his character Nobby’s girlfriend Dawn.

In the passage obtained by People Magazine, Rebel has alleged that Sacha would repeatedly ask her to strip off for scenes despite her ‘no nudity’ rule.

Rebel Wilson has made explosive claims about her experience with Sacha Baron Cohen who she has branded an ‘a**hole’ in her new memoir, Rebel Rising

The Australian actress, 44, worked with the British star, 52, on The Brothers Grimsby (2016), where she played the role of his character Nobby’s girlfriend Dawn

The most shocking allegation is that he requested she ‘stick her finger up his a**’ because he thought it would make a funny scene in the film.

Rebel writes: ‘It felt like every time I’d speak to SBC, he’d mention that he wanted me to go naked in a future scene. I was like, “Ha, I don’t do nudity, Sacha”.’

Rebel claimed that she was allegedly summoned by a product assistant for an additional scene while shooting in Cape Town, South Africa.

Rebel says: “OK, well, we’re gonna film this extra scene,” SBC says. ‘Then he pulls his pants down’, SBC says very matter-of-factly: “OK, now I want you to stick your finger up my a**.” And I’m like, “What?? … No!!”‘

Rebel claimed she was shocked and wanted to get out of it, adding: ‘I was now scared. I wanted to get out of there, so I finally compromised: I slapped him on the ass and improvised a few lines as the character.’

The Bridesmaids actress also claimed she only agreed to a 𝓈ℯ𝓍 scene with Sacha after several rewrites and recalled allegedly telling the producers that she wouldn’t be promoting the film ahead of its release.

Sacha has strongly denied ever mistreating Rebel or pressuring her to be naked in the film.

A spokesperson for Sacha, said: ‘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 The Brothers Grimsby.’

Sacha’s team also provided nine anonymous statements from crew members that backed the claim that the scene was in the script.

Rebel said that she feels it is ‘karma’ that the film didn’t perform well at the box office when it was released.

It comes soon after Rebel spoke out to thank fans for their support as she insisted that she won’t be ‘bullied or threatened’ on Tuesday.

Taking to Instagram, she wrote: ‘Thanks so much to everyone who has sent gorgeous messages of support in the last few days and to those who shared with me their stories of this a**hole!’

‘Don’t worry I won’t be bullied or threatened by this guy! And am working hard behind the scenes to make sure my book comes out! Ps my book is not ABOUT this guy – this is one chapter!’

Rebel originally claimed she was facing potential legal action after dedicating an entire chapter to a difficult working experience with a then unnamed former co-star – branded an ‘a**hole’ by her.

She later confirmed the actor in question is Sacha, best known for his comedy creations Ali G and Borat.

Sacha has strongly denied ever mistreating Rebel or pressuring her to be naked in the film

Sharing an Instagram post on Sunday, she wrote: ‘I will not be silenced by high priced lawyers or PR crisis managers. The a****** I am talking about in ONE CHAPTER of my book is: Sacha Baron Cohen.’

The post came just two days after the Pitch Perfect star alleged that a celebrity she once worked with was threatening her over the release of the memoir.

‘I wrote about an a**hole in my book,’ she told Instagram followers. ‘Now, said a****** is trying to threaten me. He’s hired a crisis PR manager and lawyers.

‘He is trying to stop press coming out about my book. But the book WILL come out and you will all know the truth.’

In an Instagram video shared on March 15, Rebel revealed that she has dedicated a chapter in her book to the ‘massive a**hole’ she worked with in Hollywood.

She claimed she would eventually name the male colleague, whose alleged behaviour prompted her to adopt a ‘no a**holes policy’ on set.

She wrote: ‘When I first came to Hollywood, people were like, “Yeah, I have a no-a**holes policy that means, like, I don’t work with a**holes.” I was like, “Yeah, I mean, that sounds sensible and logical.”

‘But then it really sunk in what they were meaning by that, older people in the industry. Because I worked with a massive a**hole, and, yeah, now I definitely have a no-a**holes policy.

‘Chapter one said a**hole — it is chapter 23, that guy was a massive a**hole.’

She added: ‘Do you want to know who is the biggest a**hole I’ve ever worked with in Hollywood? Chapter 23 lists it all out! Do you wanna know why I have a ‘no a**holes’ policy now with people I work with?

‘I wrote about an a**hole in my book. Now, said a****** is trying to threaten me. He’s hired a crisis PR manager and lawyers.

‘Well it’s all in the book: REBEL RISING available for pre-order now (drops April 2nd, link in bio)… oh and YES I name the a**hole!’

Rebel and Sacha starred together in Grimsby alongside Mark Strong, Gabourey Sidibe and Isla Fisher – Sacha’s wife of 14 years.

Sacha portrays reformed football hooligan Norman ‘Nobby’ Grimsby who is forced to go on the run with his brother – a secret agent played by Kingsman star Mark.

Rebel plays his on-screen love interest Dawn while Sacha”s real-life love and fellow Australian actress Isla plays Jodie Figgs.

The film was lambasted by critics, and it currently holds a 34 percent rotten rating from the most prestigious reviewers surveyed by Rotten Tomatoes.

In Grimsby Rebel plays Sacha’s on-screen love interest Dawn (pictured), while the actor’s real-life love and fellow Australian actress Fisher plays Jodie Figgs

Sacha, dressed in character, and wife Isal attend the Grimsby world premiere in 2016