Now Kit is giving some rare insight into his first six months of fatherhood, speaking to Access Hollywood in an interview published on Saturday.
"You know, they tell you, but they don't tell you," the 34-year-old said. "Everyone goes, 'Look, it's big. What you're about to go through is big.' And you have no way of knowing that until it happens."
Kit went on to say that finding and understanding the "new dynamic" he and Rose have as a family of three has been "beautiful."
Back in 2019, Kit reflected on the origins of his relationship with Rose in an interview with GQ Australia.
You can watch Kit Harington's interview with Access Hollywood in full here: