Angelina and Brad's long distance love letters

Angelina Jolie and Brad Pitt kept in touch via love letters while she was in Australia.

The 39-year-old actress was kept busy in Sydney on the set of new movie Unbroken, which she directed.

Meanwhile, Brad was on the opposite side of the world shooting his upcoming film Fury.

So the pair, who have six children together, decided to keep the romance going during their time apart by penning notes to each other.

"He was supportive from a distance, and it was quite romantic in a way," Angelina told Australia’s TV Week magazine.

"We decided to be of that time, when we could imagine he was in the European theatre and I was in the Pacific theatre, and we wrote handwritten letters to each other that were very connecting for us, thinking of the people that were separated for months, if not years, at a time back then."

Angelina’s new film Unbroken tells the story of World War II veteran Louis Zamperini.

And the actress said as well as being honoured to tell Louis’ story, she was also incredibly proud to have shown him the finished product before he died on July 2.

Louis died in at the age of 97 from pneumonia.

“I brought him the film on my laptop in the hospital, and it was amazing seeing someone at the end of their life watching their life unfold again, at the same time their body was shutting down," Angelina added.

"He wanted me to make the movie to show something hopeful about the strength of the human spirit that can pull us through. He reminded me to have my surgery in the year that I did, and he reminded me to appreciate every day of my life."