It's a particularly exciting week for the droves of Game of Thrones fans out there. Because after waiting a full year since the last finale, Season 7 will finally premiere this Sunday. And with just two short season left before the tale of Westeros concludes forever, there's plenty of big moments to look forward to. One of the longest standing mysteries on Game is the true lineage of Jon Snow, and while we learned that Lyanna Stark was his mother through Bran's flashback in the finale, his father's identity has yet to be confirmed. But actor Nikolaj Coster-Waldau might have let slip the most obvious secret out there: that Jon is part Targaryen.