The 24-year-old actress recalled the moment while promoting her upcoming film 'Focus', reported People magazine.
Robbie had an intense scene to perform with DiCaprio at the audition for the part of the star's wife, Naomi in the 2013 film.
Though the actress did not plan to hit him, Robbie changed her mind in a matter of few seconds when she realised she had little time to impress the makers.
The first scene together quickly turned out of control, she added, creating the perfect tension for their reckless coupling in the film.
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"And so I start screaming at him (Leo) and he's yelling back at me. And he's really scary. I can barely keep up. And he ends it saying, 'You should be happy to have a husband like me. Now get over here and kiss me,'" she recalled.
Quickly, the Australian-born actress reeled from her bold choice, her mind racing with thoughts about possible repercussions.
"I'm thinking, 'You just hit Leonardo DiCaprio in the face. They're going to arrest you because that's assault. You're definitely never going to work again, that's for sure. They'll probably sue you as well in case there's a bruise on his face and he needs to film something else.'"