Gillan says her life of drugs, prostitution and porn was "saved" by the show, reports dailymail.co.uk.
“'Game Of Thrones' saved my life. I couldn't have gone on for much longer. I was addicted to cocaine and to keep the supply I needed, I had to sell my body three or four times a week,” Gillan told The Sun newspaper.
“I was earning thousands of pounds a time for sleeping with wealthy punters. They'd pay a fortune knowing they were having sex with a porn star. I'd get as much as 4,000 pounds for an all-night session. I should have been set up for life but all the money was being blown on drugs. I was a train crash,” she added.