Kit Harington could never work alongside his fiancé Rose Leslie again.

The 30-year-old actor starred alongside his future wife in 'Game of Thrones' but admits it would never happen again because he just "wouldn't be able to keep a straight face" around her on set.

He said: "I wouldn't be able to keep a straight face. Honestly, I was watching Sliding Doors with her the other day, and there's a bit at the end where John Hannah is pouring his heart out to Gwyneth Paltrow and she's lying dead. I turned to Rose and I said, 'I wouldn't be able to do that with you, because you would piss yourself.' She's a brilliant actor. "

Actor Kit Harington and actress Rose Leslie attend the season 7 premiere of Game Of Thrones. Photo / Getty
Actor Kit Harington and actress Rose Leslie attend the season 7 premiere of Game Of Thrones. Photo / Getty

"Actually I don't want to work with her because she would just show me up again. That's why."

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Kit recently moved in with Rose, 30, and absolutely loves sharing a house with his partner.

He added: "Me and Rose, my girlfriend, said we need a few months together in London for some downtime. We've just moved in together. I've never lived with a partner before. It's amazing."

However, Kit and Rose do have one rule - they will not both take photographs with fans when they are together as they want to make sure their relationship isn't "defined" by their characters.

(L-R) Rose Leslie, Maisie Williams, Kit Harington, Emilia Clarke and Natalie Dormer. Photo / Getty
(L-R) Rose Leslie, Maisie Williams, Kit Harington, Emilia Clarke and Natalie Dormer. Photo / Getty

He told The Times newspaper: "The tough bit is when you are on holiday and people want photos with both of you. We don't do that, because there is a line where you go, 'Our relationship is not one of two puppets who are like walking advertisements.'

"So one of us will have a photo taken and the other will say no. That's important - that your relationship isn't defined by what you were as two characters in the past."