'We all fart': Michael Fassbender outs French actress Marion Cotillard for her flatulence habits on the set of Assassin's Creed

It appears nothing is off limits for Assassins's Creed co-stars Marion Cotillard accused Michael Fassbender as they promote their new film in Australia.

And a day after the French actress accused the hunky actor of sexual workout noises, he has hit back by detailing her flatulence habit.

In an interview with Yahoo, the 39-year-old actor was quick to fess up about her farts when asked to reveal 'shameful secrets' about each other.

'We all fart': Michael Fassbender outs French actress Marion Cotillard for her flatulence habits on the set of Assassin's Creed as they speak to Yahoo on Tuesday

'Your flatulence... But we're not going to talk about that. That wouldn't be right,' he said with a smirk, as the actress began to laugh.

Taking it well, Marion giggled and jokingly pleaded: 'Please, let me be a glamorous actress. I should have never...'

Michael seemingly tried to save the conversation by saying: 'we all fart, let's face it.'

Marion agreed with his point, but claimed they should keep the story to themselves before dodging further flatulence questions form the reporter by joking about her English comprehension.

'Please, let me be a glamorous actress!' Marion pleaded for Michael to stop airing her 'shameful secret' as she burried her head in her hands as she giggled

It comes only a day after Marion revealed Michael's bad habit on-set of their new film while speaking on The Project.

The Academy Award-winning star, 41, said Michael can be distracting as 'he works out a lot. And he's very vocal'.

'And sometimes you don't even know if he's actually working out or doing something else,' she added with a sly glance at Michael. 

'Sometimes I was yelling, "Stop it now",' she continued.

Michael promptly responded with the cheeky note: 'They're all calorie burners'. 

'He's very vocal': Marion Cotillard revealed on Monday night's episode of The Project that her Assassin's Creed co-star Michael Fassbender is very vocal when he exercises on-set

Australian promotions: The co-stars recently posed in front of Sydney Opera House on Monday to promote the new film's release down under

They posed in front of Sydney Opera House on Monday to promote the new film's release.

The movie is an adaptation of the Ubisoft video game series, which now comes in the form of nine main games and a number of supporting materials, but it is unclear if further movies have been predicted.

In Assassin's Creed, Michael plays a very physical role in the video game screen adaptation, in which he is seen with a muscular torso parkouring through 15th Century Spain.

It's obvious by the trailers, the action hero has been keeping in shape, and may have incorporated his past training for X-Men's Magneto or a Spartan man in 300 for the role.

Assassin's Creed hits Australian cinemas from January 1.

Coming soon! Assassin's Creed, based off the popular video game series by Ubisoft, hits Australian cinemas from January 1

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