The pair met on the set of the hit HBO series in 2012 while playing Jon Snow, heir to the Iron Throne, and his love interest, Ygritte, woman of the Free Folk, reports the People.
They reportedly split up a year later, but reconciled and continued to fuel romance speculations, until they officially confirmed the relationship in April 2016 after making their red carpet debut as a couple at the Olivier Awards in London.
"Because the country is beautiful, because the Northern Lights are magical, and because it was there that I fell in love. 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," Harington said at the time of falling for Leslie.
Reps for the couple are yet to confirm on the news. (ANI)