IT was the on-screen romance that sparked a thousand memes — and now, five years later, a real-life engagement. Kit Harington and Rose Leslie are engaged, a source confirms to People.

The actors first stirred up relationship rumors in 2012, in sync with their fictional “Game of Thrones” counterparts, Jon Snow and Ygritte.

Though they reportedly split after a year, they later reconciled and continued to fuel romance speculation until they officially confirmed the relationship in April 2016, making their red carpet debut as a couple at the Olivier Awards in London.

A month after going public with the relationship, Harington, 30, opened up about the early days of the romance, which began on set while shooting in Iceland for season 2 — sweetly admitting that those weeks were his favorite of the series, and for good reason.

“Because the country is beautiful, because the Northern Lights are magical, and because it was there that I fell in love,” he said in a cover story for L’Uomo Vogue. “If you’re already attracted to someone, and then they play your love interest in the show, it becomes very easy to fall in love.”

Back in 2014, Leslie, 30, also touched on her relationship with her heartthrob costar in an interview with People.

“Kit is a lovely and funny man, and a dear friend,” she said. “We had known each other before we started working together on ‘Game of Thrones.’ It was always such a privilege to be working opposite him and such a blessing that we get on in real life because it made our characters more believable.”

Their reps did not respond to requests for comment. (SD-Agencies)