Margot Robbie has revealed a shocking behind the scenes secret from the set of her hit movie, Wolf Of Wall Street.

The actress said there was an entire ‘merkin’ (genital wig) room on set.

The I, Tonya star, 32, said she was comfortable shooting a ‘debaucherous party’ scene for her new movie Babylon because she did nude scenes in her 2013 breakthrough role alongside co-star Leonardo DiCaprio.

‘You get desensitised so fast. It felt like a lifetime and also like a distant hazy memory,’ she told Nova’s Fitzy and Wippa.

Fitzy asked if it was hard to find actresses with appropriate body types while filming and Margot said the costume department always had a backup plan.

‘They have things called merkins, which is like a wig that for genitalia. I remember for Wolf of Wall Street, there was an entire merkin room,’ she said.

‘I guess people would go in and pick one out. It was fascinating.’

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Earlier this week, Margot revealed the surprising reason her school friends affectionately call her ‘Maggot’.

During an appearance on The Project on Tuesday night to promote Babylon, the two-time Oscar nominee explained the nickname was the result of an embarrassing mishap in primary school.

‘That has been my nickname since I was six years old,’ Margot told the panel.

‘I think a substitute teacher made a mistake on the roll call and said “maggot” and everyone laughed,’ she continued.

‘You can’t pick a nickname. You get given to it,’ The Wolf of Wall Street star added.

Robbie went on to say that at the time she hoped the blunder would have become a distant memory by lunch time, but ‘here we are’ still talking about it almost over two decades later.