Rebel Wilson claims her experience with Sacha Baron Cohen led to an eating disorder after the actress accused him of sexual harassment in bombshell memoir

Rebel Wilson has claimed her alleged experience with Sacha Baron Cohen led to an eating disorder in her bombshell new memoir.

The Australian actress, 44, made shock claims about her experience with 'a**hole' comedian Sacha Baron Cohen in her memoir, Rebel Rising.

She alleged that on the set of 2016 comedy The Brothers Grimsby, Sacha would ask her to strip off for scenes despite her 'no nudity' rule, in a string of claims which Sacha has strenuously denied and says are contradicted by evidence.

In a memoir passage obtained by People Magazine, she shockingly alleged that Sacha requested she 'stick her finger up his a**' because he thought it would make a funny scene in the film and claimed 'it felt like [he] had sexually harassed me'. 

Rebel also claimed the alleged inappropriate experience with the Borat actor led to an eating disorder as she detailed the 'disrespect' she felt.

The Pitch Perfect star recalled how she felt 'completed disrespected, which led to me treating myself with even more disrespect by eating in an extremely unhealthy way'.

Daily Mail Australia has contacted Sacha's representative for further comment. 

Rebel played Sacha's on-screen girlfriend in the 2016 Louis Leterrier-directed film and has made a series of allegations about her uncomfortable experience during shooting.

Rebel claimed that during filming, Sacha would repeatedly 'mention that he wanted me to go naked in a future scene', which she alleged was in 'no way essential' to the film's plot.

In her book, which was released in the US on Tuesday, she wrote: '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 said: '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.

However, newly emerged footage from the sex scene in the 2016 film seems to show that the action was part of the script and the actress was on board with the scene.

Several never-before-seen clips from the movie that failed to make the final cut were obtained exclusively by DailyMail.com and depict Rebel and Sarah's characters using a cellphone to film themselves getting intimate.

In the clips, Rebel can be heard discussing the scene while on camera but out of character, telling Sacha: 'I'll do a slap [of your butt] and I'll do a – going down the crack', to which he replies: 'It's almost as if you're going to ram your fingers inside,' prompting her to answer 'yeah'.

According to those close to Sacha, director Louis Leterrier had to discuss any nudity or sex scenes with Wilson before they were shot. They say she agreed to the scene.

They also say that the cell phone was used because the movie called for Rebel and Sacha's characters Dawn and Nobby to use an iPhone to film themselves having sex.

However, in a statement given to DailyMail.com, Rebel doubled down on her book's description of Sacha as an 'a**hole'.

'It is an a**hole move to release footage of one part of that disgusting episode while leaving out everything that preceded it including my horrified refusal to stick my finger up SBC's butt,' she said.

'This could not have possibly been for the film as the director Louis Leterrier was not even present,' she claimed.

'What this edited video shows is what I had to do in order to get out of the room, as written in Rebel Rising. Releasing unauthorized and misleading behind the scenes video without my approval is SBC's latest way of bullying and gaslighting me.'

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.