VIDEO : How did Game of Thrones' Kit Harington and Rose Leslie Fall in Love?

Kit Harington recalls the moment he and former Game of Thrones co-star Rose Leslie fell in love. The actor, who plays Jon Snow on the HBO series, and Leslie, who played his character's love interest Ygritte, have been dating on and off since 2012. A source had told E! News in January Harington and Leslie had rekindled their romance . The two, who are notoriously private, officially stepped out as a couple in April.In a recent interview with Vogue Italia, Harington reminisced about how the two fell in love while filming Game of Thrones. He called his time shooting season two in Iceland his favorite show memory.