The couple met on the set of the hit fantasy show – where Rose played Ygritte for three series, and Kit portrayed Jon Snow – and got together in 2012.
Since then, they have kept a low profile when it comes to their relationship, with Rose choosing to reveal she’s expecting in an understated way, in a photo-shoot with Make magazine, in which her pregnancy bump is visible.
The magazine’s fashion editor Ursula Lake shared one such picture on Instagram, writing: “So wonderful working with the beautiful Rose Leslie for the cover story of Make magazine out now!
“A very special all-woman team photographic shoot capturing Rose at this wonderful time as she prepares for motherhood for the first time!”
In the accompanying interview, Rose spoke about her home with Kit in the English countryside, saying she was looking forward to raising a family there, after years of living in New York.
“What a glorious thing to be able to run to the countryside and recoup,” she said.
“It’s a great privilege to be surrounded by greenery, birdsong and hedgerows, and our delightful neighbours. It’s so peaceful.”