The Suicide Squad star's older brother, Lachlan Robbie, shared the same photo and congratulated his sister.
"Congratulations to my little sister and new brother 👊🏼," he wrote.
According to News.com.au, the couple exchanged vows in front of 50 guests in a teepee on private property in Coorabell, in Byron Bay.
Guests, who were made to hand in their mobile phones, were reportedly not aware of the wedding location, instead they were taken by buses from a number of different locations in Byron Bay and the Gold Coast.
Suspicions of the Suicide Squad star’s secret wedding arose when Robbie arrived at an airport in her home country last week wearing a T-shirt that read “Say ‘I Do’ Down Under.”
Robbie and the British assistant director met in 2013 on the set of the World War II drama Suite Francaise.
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