At least one "Game of Thrones" mystery has been solved: Former co-stars Kit Harington and Rose Leslie are officially a couple.

The pair — who tussled onscreen and shared a steamy night in a cave a couple seasons ago before Leslie's character took an arrow to the heart — made it official on the red carpet for the Olivier Awards in London, holding hands and laughing and kissing and generally being adorable.

RELATED: Oscar Isaac saved Poe Dameron — could he change the fate of Hamlet, too? 

Rumors of their hooking up started back in 2012 and have come and gone ever since, but at least there's some certainty in our "Thrones"-related lives for once. Speaking of which, does this mean Leslie knows whether Jon Snow is really dead or not? Spill it, sister.