\"I actually stalk her hashtag on Instagram! Even though we are sisters [in 'Game of Thrones'], we tried to sneak a kiss into every scene we did together to freak everyone out a bit,\" Turner said. \"It kept them on their toes making sure they were following the script.\"

Williams shared that her best friend and co-star, Turner, has been her constant source of support through good and bad times.

\"Sophie knows too much about me to not be my friend,\" she told the publication.

\"I can’t tell you the amount of times Sophie said, 'Go to therapy,' before I actually did,\" she continued. \"She really helped me through some messy break-ups and some friend break-ups.\"

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Williams, who will be a bridesmaid at Turner's upcoming wedding to singer Joe Jonas, said her friend has given her advice while dealing with important issues like her own mental health.

\"Whenever I’m like, 'I need help! This is bigger than anything I can sort out on my own,' Sophie is my point of call. I think therapy is so important. You should absolutely speak to someone, even if in your head you go, 'Yeah, I knew that!'\" she said.

The two star in the upcoming final season of \"Game of Thrones,\" which premieres April 14.

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