The 22-year-old actress and Maisie, 21, are best-known for their starring roles in the hit TV series 'Game of Thrones', and Sophie has revealed how they both used to relax after shooting an episode of the show.
Sophie - who plays Sansa Stark on the HBO fantasy series - shared: ''We're kind of like loners on 'Game of Thrones', just because the past few seasons Maisie and I have sleepovers every night when we're shooting. Or every night whenever both of us are in town. We just used to sit there and eat and watch stupid videos and smoke weed.
''I don't know if my publicist will kill me for saying this. We'd get high and then we'd sit in the bath together and we'd rub make-up brushes on our faces. It's fun.''
Although Sophie and Maisie's friendship has grown stronger over the years, they've always got on well.
Sophie - who is engaged to Joe Jonas - told Vulture: ''We did a chemistry read together.
''It was the final three for Sansa, and I was like, 'F**k, I really need to up my game.'
''I went in, and was I like, 'What's up?!' I gave her a big hug. I was like high-five after every take. I was super extra, but it worked. I read with other Aryas before, but Maisie was special. We just got on like that.''
Meanwhile, Sophie recently admitted she's struggling to accept that 'Game of Thrones' is ending.
The actress has played the role of Sansa since the HBO fantasy epic's launch in 2011, and she's still trying to come to terms with the fact that next year's eighth season is the show's last.
She said: ''I still don't accept that it's done. It's basically been the majority of my life. I'm still very much processing it.''
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