Nicole Kidman shares childhood photo of herself with her lookalike sister Antonia on her birthday

Hollywood megastar Nicole Kidman is known to be close to her mother Janelle and her lookalike sister Antonia. 

And on Wednesday, the Academy Award winner shared a sweet tribute to Antonia as she turned 51.   

Nicole, 54, posted a flashback photo of the pair from their childhood and wrote: ‘Love sharing this life with you.’

Looking back: On Wednesday, Nicole Kidman shared a sweet childhood photo of herself with her lookalike sister Antonia as she paid tribute to her on her birthday. Nicole is pictured left and Antonia, right

‘To my darling sister – Happy birthday, love sharing this life with you,’ adding a cake, love heart and star emoji. 

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, presented by Tiffany & Co, 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.   

Recalling how they first met over two decades ago, the Big Little Lies talent said: ‘I’ve known him since we were in our early 20s. We went to dinner at a place in London called The Ivy with his then girlfriend Liz Hurley and my sister and just a huge bunch of people and we just kind of clicked.’

That night Hugh became fascinated with Nicole and her sister’s special style of communicating. 

Family: Nicole is pictured with Antonia and their mother Janelle

Nicole explained: ‘My sister and I were speaking our secret language and who was like fascinated because my sister and I have this language that we can speak so we can be understood in a crowd and nobody can understand us.’

O’Neill prodded for a bit more information but the Moulin Rouge star only laughed saying: ‘If I end up telling you then you’ll be able to decode it.’ 

Nicole called the secret language ‘silly’ but said it’s always come in handy.

‘It is helpful, let me tell you. It was really helpful when we were like at parties and they were and we had our boyfriends and stuff we would be able to use our language and they’d all be like “What?”‘

‘It’s a really good tip all the sisters out there,’ she went on.

Nicole explained: ‘My sister and I were speaking our secret language and who was like fascinated because my sister and I have this language that we can speak so we can be understood in a crowd and nobody can understand us’