It is one of the most legendary romances in cinematic history, but it turns out that Star Wars' starring couple didn't just keep their relationship to the screen.

Carrie Fisher has revealed in her new memoir The Princess Diarist, out November 22, that she and Harrison Ford slept together once while filming the iconic movie.

The pair first met in 1977 in London, when Ford was 34 and Fisher just 19. However, diary excerpts included in the book reveal that it wasn't until they got to Tunisia that their romance spread to real life.

Fisher reveals that she was "wine-sodden" and that Ford offered to drive her home, where the two ended up in bed.

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The actress tells People: "It was Han and Leia during the week, and Carrie and Harrison during the weekend."

RadarOnline quotes her as saying that she was a bad kisser and felt bad, but Ford's love making wasn't exactly up to scratch either.

She let it slide since he "really was handsome".

The pair reunited on-screen last year in the seventh film, The Force Awakens.
The pair reunited on-screen last year in the seventh film, The Force Awakens.

The affair lasted the rest of the shoot, time Fisher spent fantasising that Ford would ask to marry her and give her jewellery engraved with 'Carrison'.

At the end of the movie, Ford returned to his then wife Mary Marquardt, though Fisher takes no blame for the pair's eventual break-up.

The pair have appeared in four Star Wars films together, most recently last year's The Force Awakens. Fisher has previously admitted to having had a crush on Ford during filming and wanting to have an affair while filming.

Let's just be glad no kids turned up as a result. We all know how that turned out ...