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She explained in her post that she was reminded of when he told her this in New York, after she filmed a scene and had to say it on Home and Away.
'Yesterday in a scene, I had to say the words: ''It's you and me against the world," Penny said.
Penny, 38, shared on Instagram a series of throwback images of the pair from when they lived in New York together (pictured), and revealed Matt would always tell her that it was 'them two against the world' when things got tough
'I was suddenly transported back to New York in 2011, when Matt and I moved to Brooklyn with no jobs, no visas and no friends.'