The couple looked completely comfortable in front of the cameras, even stealing a kiss while posing on the red carpet.
Leslie and Harington's GoT co-star, Emilia Clarke, told ET that she's thrilled that the two are an item. "My goodness! You know, we like to spread the love on our show. It's a beautiful thing," Clarke told ET's Nancy O'Dell at the Screen Actors Guild Awards in January. "She's one of my best friends, so it's good."
On their hit HBO show, the real-life couple played lovers until Leslie's character, Ygritte, died in the season four finale. Fans are still waiting to find out Jon Snow's fate after he appeared to have died during the season five finale. On the Jonathan Ross Show, the host got Harington to spill some details on his character using the "Stone of Truth." When asked if Jon Snow is dead, the actor answered, "Yes."