The actress, who began work on "Game of Thrones" when she was just 13 years old, said that growing up in the public eye made her incredibly insecure about her appearance.
Created by David Benioff and D.B Weiss, Game of Thrones, which is based on George R.R. Martin's novels, hit the TV screens in 2011.
In a separate interview, Isaac Hempstead-Wright, who played Turner's brother Bran on the series, stands with Turner and told The Wrap, "I think the petition is just kind of a weird, juvenile gesture".
Turner first met the singer at age 20, she "was going through this phase of being very mentally unwell".
This post contains spoilers for the Game of Thrones series finale.
"He was, like, 'I can't be with you until you love yourself. At 23 I leave you behind, but I will never leave behind what you have taught me", Sophie wrote on Instagram. I think no matter what anyone thinks about this season - and I don't mean to sound mean about critics here - but whatever critic spends half an hour writing about this season and makes their [negative] judgement on it, in my head they can go fuck themselves. Thank you for giving me this chance all those years ago. Fans will know George RR Martin told the showrunners how A Song of Ice and Fire's final book A Dream of Spring concludes and who ends up on the Iron Throne.
The post was extremely well received, garnering a massive amount of love and support. The petition has about one million fans who have signed it.
'So many people worked so, so hard on it, and for people to just rubbish it because it's not what they want to see is just disrespectful, ' she said. With such a lovely portrayal of a strong, female lead, Sansa is truly a character that we will never forget. "It was that she was strong in spite of all of the horrific things that she's gone through, not because of them", Turner explained. We can't wait to see what unique energy she brings to the role.
John Bradley portrays Samwell Tarly in Game of Thrones.