The former flames and Game of Thrones costars stepped out shopping together in Los Angeles on Saturday, where they held hands and shared a kiss, and at one point Leslie peeked over at Harington's phone, resting her head on his shoulder.
Harington, 29, and Leslie, 28, first sparked rumors of a connection in 2012 – as their fictional counterparts were cozying up onscreen – though that ended in a year, according to E! News.
But recent sightings have rekindled the speculation – and not for the first time. In addition to the Saturday excursion, Harington and Leslie were seen Thursday together at LAX, along with Thrones costar Sophie Turner.
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"Kit is a lovely and funny man, and a dear friend," she told PEOPLE in 2014. "We had known each other before we started working together on Game of Thrones. It was always such a privilege to be working opposite him and such a blessing that we get on in real life because it made our characters more believable."
Neither Harington nor Leslie's reps immediately responded to a request for comment. But at least one Westeros royal is giving them the thumbs-up.
""My goodness! You know, we like to spread the love on our show. It's a beautiful thing," Emilia Clarke told Entertainment Tonight. "She's one of my best friends, so it's good."
Clarke said, "I mean, there are worse things than being caught kissing Jon Snow!"