Naomi Watts as Princess Diana in new film

In a role that Naomi Watts has described as one of her most intimidating acting experiences to date, we've got the first glimpse of her in action as Princess Diana as the trailer has just been released.

Simply titled DIANA, the biopic looks set to be a moving retelling of the last two years of her life, including her campaign against land mines and her relationship with heart surgeon Dr Hasnat Khan.

Naomi Watts as Princess Diana in new film

NAOMI WATTS SAYS FILMING DIANA BIOPIC WAS SCARIER THAN DISASTER MOVIE

The moving one-minute teaser shows a glimpse of the intimate portrayal of her life, including snapshots of the overwhelming paparazzi intrusion and her charitable work around the world.

Naomi Watts as Princess Diana in new film

While we haven't heard any dialogue from Naomi yet, the trailer shows a lot of work went into her physical transformation - including a prosthetic nose - for her transformation as 'the people's princess'.

Naomi Watts as Princess Diana in new film

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DIANA is coming to cinemas 20 September -  we can't wait.   

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WATCH THE TRAILER HERE: