Rose, 31, was a vision as she headed into the chapel on the arm of her father clad in a billowing white gown with a lace bodice and intricately beaded veil that she secured upon her tousled auburn hair. They will get hitched at Wardhill Castle in Aberdeenshire, which has been in Leslie's family for 900 years.
Guests including fellow Game of Thrones star Sophie Turner - who herself is engaged to Joe Jonas - as well as Maisie Williams and Peter Dinklage.
A date of June 23 was previously posted at Aberdeenshire's Huntly registration office.
Speaking outside the castle on Saturday, Sebastian Leslie said: "We are absolutely thrilled for Kit and Rose to be marrying today".
"My goodness! You know, we like to spread the love on our show. We are using local caterers, local lighting, local flowers".
He waved at fans who have been gathering in and around Inverurie hoping to catch a glimpse of the show's stars.
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Splinter slammed Twitter by highlighting a number of still-active tweets that would appear to violate the company's rules. Users who shared Miller's number were forced to delete the tweet and had their accounts locked out for several hours.
The actors met in 2012 while filming the long-running saga in Iceland, where they were playing Jon Snow and Ygritte.
The couple, both 31, who starred together in the TV blockbuster for four seasons, confirmed their engagement back in September a year ago.
Leslie left Game of Thrones two years after they met, while Harington has become one of the show's most popular stars.
"Because the country is lovely, because the Northern Lights are magical, and because it was there that I fell in love", he recalled.
The Good Fight actress Leslie said she had been too busy to plan the wedding, telling Town And Country magazine: "I haven't tackled it". It's nearly too much to handle - especially when you consider how damn goooOOoooooOOood he looks.

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