After the ceremony, Harington and Leslie celebrated with a reception at Wardhill Castle.
A wedding date of June 23 was previously posted at Aberdeenshire's Huntly registration office.
And Rose arrived shortly afterwards, accompanied by her father, Seb Leslie.
"My goodness! You know, we like to spread the love on our show".
The Game of Thrones cast and crew are now shooting the show's eighth and final season that will air next year, but Harington was adamant about making sure his co-stars could witness his nuptials.
Fans of Game Of Thrones have been gathering outside Wardhill Castle in Aberdeenshire hoping to catch a glimpse of the couple.
He's previously opened up about falling in love with Leslie on set in Iceland, telling L'Uomo Vogue it was "Because the country is attractive, because the Northern Lights are magical, and because it was there that I fell in love". The couple announced their engagement in September, 2017.
"Because the country is handsome, because the Northern Lights are magical, and because it was there that I fell in love", he said.
In January, Leslie told Town & Country the planning for their wedding was hard to do because of their busy schedules. "There's just too much to do".