Fans of the show gathered outside the castle hoping to catch a glimpse of the couple.
And Rose arrived shortly afterwards, accompanied by her father, Seb Leslie.
Guests at the wedding include Game Of Thrones stars Peter Dinklage, Maisie Williams, Sophie Turner and Emilia Clarke, actor Jack Donnelly and his partner, actress Malin Akerman. "We were in the country and we were under this handsome night sky and had a log fire burning and red wine and I blew my load early", he said before laughing at the very obvious sexual insinuation.
"My goodness! You know, we like to spread the love on our show".
The 23 June date was posted at the Huntly registration office last month.
Leslie, born Rose Eleanor Arbuthnot-Leslie, first rose to fame in Season 1 of BBC's hit drama "Downton Abbey".
The couple announced their engagement last September, five years after they met on the HBO series.
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The duo, who began dating back in 2012, broke the news of their engagement by placing an announcement in The Times newspaper. Thankfully that wasn't the case at the wedding of Kit Harington and Rose Leslie in Aberdeenshire, Scotland this morning.
It's a Game of Thrones wedding weekend!
Both Harington and Leslie look every bit the romantic, ideal couple. She began appearing on "Game of Thrones" in Season 2 until her character, the wilding Ygritte, the love interest of Harington's Jon Snow, was killed off in Season 4.
"Because the country is lovely, because the Northern Lights are magical, and because it was there that I fell in love", he recalled.
"I was going to string up some lights in some trees and do all the romantic stuff", he revealed. I'm a sucker for a beaming dad on his daughter's wedding day. "I popped my question a bit early", he said on Britain's "The Jonathan Ross Show".
The Brit actress wore a billowing blush midi-length dress, paired with a muted pink draper jacket as she watched her friends and co-stars Wednesday.