The starlet was accompanied into the church by her dad, Sebastian Leslie, who honoured their birthplace by wearing a kilt. The 31-year-old actress is now starring on The Good Fight, while Jon Snow is now romancing Clarke's character, Daenerys Targaryen - but Harington and Leslie taking their romance off-screen is all good in Clarke's book.
They announced their engagement in the London Times past year and are expected to marry at Wardhill Castle.
Kit and Rose's nuptials took place in front of a star-studded crowd, with the couple's Game Of Thrones co-stars turning out to wish the couple well and watch them tie the knot. Leslie was born to a noble family in Scotland and was raised at Lickleyhead Castle, her family's 15th century ancestral seat. I was meant to do it the day after with the lights.
Among the guests who are celebrating the couple's big day are their Game of Thrones co-stars, including Emilia Clarke, Peter Dinklage and Sophie Turner. They look precisely 500 times more stylish than I will ever look in my lifetime.
Peter Dinklage, 49, best known for portraying fan favourite Tyrion Lannister, was pictured making his way into the ceremony. "Sorry, that's a really bad expression!"
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Harington told L'Uomo Vogue it was "easy" to fall in love with his co-star.
"If you're already attracted to someone, and then they play your love interest in the show, it's becomes very easy to fall in love...".
He said: "Because the country is handsome, because the Northern Lights are magical, and because it was there that I fell in love".
BRB, swooning forever. No word yet on whether the couple plans to honeymoon in remote ice cave somewhere.
And in 2017, Harington couldn't help but gush to ET about how he found a real-life love connection on GoT.
Congratulations to the lovely couple!