But, somewhat inconsiderately, the high-profile pair have barely given their wedding day a second thought - they're just too busy working on their sky-rocketing careers. Rude.
"I haven't tackled it," Leslie says in a recent interview with Town & Country. "There's just too much to do."
Apparently, she and Harington are currently prioritising frantic filming schedules over seating charts and floral arrangements.
Harington has revealed during an interview that he had fallen in love with Leslie as they filmed season three. When asked about his favourite season he said:
"Because the country is beautiful, because the Northern Lights are magical, and because it was there that I fell in love," he said. "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."
Bring on the wedding!