Australian actress Rebel Wilson has had a colourful career since emerging in Hollywood since her big break in 'Bridesmaids' in 2011.

Now, she's set to write about it in her forthcoming memoir - but it seems that one of her fellow actors is not happy about being mentioned.

Last week, Wilson told her Instagram followers that she had previously worked with an 'asshole' and intended to reveal their identity in the book, 'Rebel Rising'.

"When I first came to Hollywood, people were like, yeah, ‘I have a no asshole policy, [it] means like, yeah, I don’t work with assholes'," she said in a video. "I was like, ‘oh yeah. I mean, that sounds sensible or logical. But then it really sunk in - because I worked with a massive asshole and yeah... now I definitely have a no assholes policy."

She added: "The chapter on said asshole is chapter 23. That guy was a massive asshole."

Now, Wilson has revealed that the person she is talking about is Sacha Baron Cohen, who she worked with on the 2016 film 'Grimsby'.

Over the weekend, Us Weekly report that Wilson posted an Instagram story before deleting it where she said "I wrote about an asshole in my book. Now, said asshole 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."

She added in a later story posted yesterday: "I will not be bullied or silenced by high priced lawyers or PR crisis managers. The “asshole” that I am talking about in ONE CHAPTER of my book is: Sacha Baron Cohen."

Wilson had previously spoken of Baron Cohen negatively, including discussing his uncomfortable requests on the set of 'Grimsby'. She told an Australian radio show: "Every day he’s like, ‘Just go naked, it will be funny. Remember in 'Borat' when I did that naked scene? It was hilarious.’ On the last day I thought I’d obviously won the argument, and he got a body double to do the naked scene.

"Then in the last scene … he was like, ‘Rebel can you just stick your finger up my butt?’," she continued. "And I went, ‘What do you mean Sacha? That’s not in the script.’ “And he’s like, ‘Look, I’ll just pull down my pants, you just stick your finger up my butt, it’ll be a really funny bit.'"

Baron Cohen has not yet commented on the allegation.