Andrea Mandell

USA TODAY

After nearly 40 years of keeping the secret in the vault, Carrie Fisher is coming clean: Han Solo and Princess Leia had a real-life affair.

Fisher told People magazine that when she was 19, she and Ford had a whirlwind three-month affair while filming Star Wars: Episode IV - A New Hope in 1976.

It wasn't exactly a kosher situation: Ford was then a 33-year-old married father of two. “It was so intense,” says Fisher. “It was Han and Leia during the week, and Carrie and Harrison during the weekend."

Carrie Fisher revisits 'Star Wars' past as 'Princess Diarist'

Fisher told the magazine she gave Ford advance notice she'd be spilling the tea in her new memoir, The Princess Diarist, which pulls from journals she kept while filming the franchise.

The two stars spent their first night together after a birthday party for George Lucas, Fisher recalls in her book (out Nov. 22). “I looked over at Harrison. A hero’s face — a few strands of hair fell over his noble, slightly furrowed brow,” she writes. “How could you ask such a shining specimen of a man to be satisfied with the likes of me?”

Otherwise, Fisher was mum on Twitter.

She and Ford reunited in last year's box office smash, Star Wars: The Force Awakens.