By Kylie Walters For Daily Mail Australia
Published: 11:28 BST, 1 August 2020 | Updated: 11:44 BST, 1 August 2020
She was the cute-as-a-button blonde who voiced the character of Boo in the 2001 animated hit Monster's Inc when she was just five-years-old.
But the young actress who appeared in the Pixar film has stepped away from the spotlight following a health battle and has now transformed into a bodybuilder.
'I have dreadlocks and tattoos now, so (I look) very different,' Mary Gibbs, 24, told hosts Kylie Gillies and Larry Emdur while doing a live cross to The Morning Show from her home in Pasadena, USA on Friday.
All grown up! Mary Gibbs was the adorable five-year-old who voiced the role of Boo in the 2001 smash hit Monster's Inc (left) but now she is a 24-year-old bodybuilder with dreadlocks (right)
Mary revealed it was actually a complete accident that she went on to star in the film alongside veteran actors Billy Crystal and John Goodman.
'My dad was a storyboard artist on the movie. Originally, they just needed a little girl to draw. So he brought me in just for that,' she explained.
'As the movie progressed, they needed someone for scratch dialogue. But the directors thought I was doing great and wanted to try it out for the whole movie,' she added.