The 29-year-old "Game of Thrones" actress stars alongside Sam Claflin and Jenna Coleman in the romantic-drama movie, reported Femalefirst.
"I brought my best friend to see it, and she turned round, sobbing, and said, 'You told me it was a rom-com!' Matt Lewis brought all of his rugby team with him, and he said, 'Mate, you made 12 grown men cry!'," Clarke said.
The actress said she loves watching romantic comedies as they keep the hope alive.
I watched 'Cinderella' the other day, because my Thrones mate Richard Madden is in it. And it's really good, Disney movies are folk stories. We're all just trying to find magic to elevate the mundane day-to-day life. Rom-coms make you feel like there's hope," she said.