Russell Crowe
The 'Gladiator' actor had movies in his blood as his parents Jocelyn and John were film set caterers.
However, he never had any formal training and simply uses the "Russell Crowe method" of acting.
Crowe said back in 2016: "I've never been to drama school.
"I've been acting since I was six years old and over time you get more and more efficient at getting to centre of the character.
"Seriously, it's not that complicated. If you want to be an actor, work it out for yourself."