The 33-year-old actress – who plays Queen Margaery Tyrell in the fantasy drama – never reads any of the other characters’ storylines so she can still enjoy watching the show.
She said: “I watched season one like a fan, like you. So when I joined them in the second season, I wanted to go back to feeling like a fan, so I stopped reading other people’s storylines.
“I only read the scripts that are relevant to Margaery and Highgarden and King’s Landing. So when the show airs, I’m sitting on the couch watching it like you.”
However, that doesn’t mean Natalie manages to avoid spoilers completely.
She told talk show host Jimmy Kimmel: “I’ll be sitting in the hair and make-up trailer, and someone will show up and I’ll be like, ‘What are you doing here? Oh my god, you’re back? I gotta leave.'”
And though she doesn’t like encountering spoilers herself, Natalie – who usually films her scenes in Belfast, Northern Ireland – told the presenter she had spent “a lot” of time in Spain for season six.
Asked if that was a spoiler as her character was in jail at the end of season five, she laughed and said: “There are dungeons in Spain.”