Carrie Fisher reveals she had an "intense" affair with Star Wars co-star Harrison Ford.

One of Hollywood’s longest-running rumours has just become fact: an off-screen romance between Carrie Fisher and Harrison Ford (that’s Princess Leia and Han Solo to Star Wars fans).

Yes, the actress has finally confirmed that a long, long time ago (1976), on a film set far far away (London), she and her co-star had an “intense” three-month affair while filming Star Wars: A New Hope.

Fisher's confession came via extracts of her forthcoming book The Princess Diarist, of which Ford was sent a draft for approval.

According to PEOPLE, she writes of being an "inexperienced" 19-year-old who first slept with the "very handsome" 34-year-old father of two after a birthday party for the film's director, George Lucas.

After that evening, she was reportedly wracked with self-doubt about his level of interest in her.

“I looked over at Harrison. A hero’s face — a few strands of hair fell over his noble, slightly furrowed brow,” she wrote.

“How could you ask such a shining specimen of a man to be satisfied with the likes of me?”

But their tryst continued.

"It was so intense," she told PEOPLE. "It was Leia and Han during the week, Carrie and Harrison on the weekend."

In fact, according to Radar, she writes of their affair becoming so serious that she fantasised about him giving her a "gold band with diamonds (inscribed) 'Carrison'".

However, when filming wrapped, Ford ultimately returned to his wife, Mary Marquardt, from whom he divorced three years later.

Carrie and Harrison appeared together in the most recent Star Wars film, The Force Awakens. Image: LucasFilm.

For some reason, it seems Fisher thought this 40-year-old scandal would be a revelation to the rest of the world.

But it wasn't.

It really, really wasn't.

Assume we did. After all, in a 2005 interview Fisher admitted, "I went on the film saying, 'I'm going to have an affair'," before adding, "I think I had something that happened. You know, I had a crush on Harrison."

She also raised that time she returned to a room to find him in a closet "naked but for a tie." So there's that.

What did come as a surprise, though, were suggestions in other outlets that she wrote about Ford being less than stellar in bed - suggestions she cleared up via Twitter.

It may not have been considered reliable evidence anyway - according to Radar, the now 70-year-old says her memory of the fling is compromised, largely because of the "brutal strength of Harrison's preferred strain of pot".