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In the image, both Nicole and Antonia pose by the water and wear matching shorts, T-shirts and hats.
In October last year, Nicole revealed just how close she is to her sister.
Close: In October last year, Nicole revealed just how close she is to her sister. At the time, she revealed they have their own secret language
During a chat with WSJ Magazine Editor in Chief Kristina O Neill to promote her show The Undoing, Nicole admitted that she and Antonia have their own secret language.
The topic came up after Kidman was asked about her connection to co-star Hugh Grant.
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