Kit said: 'He is about the get the shock of his life, which is that he's about to get a brother or sister.'
The actor then confirmed Rose, 35, is pregnant with their second child and admitted he's scared of welcoming another tot into the family.
Congrats: Kit Harington has revealed he and wife Rose Leslie are expecting their second child together and admitted he is 'terrified' (pictured in January 2023)
He said: 'You know with the first baby, you're like, walking on clouds and dancing through fields and daisies for nine months? Well, the man is anyway.
'This time, the reality check comes much shorter and you get practical, like, real quick.'
Kit then said he and Rose have been trying to explain to their toddler that he is going to have a sibling but he 'doesn't quite conceptually understand it just yet'.
He said: 'We are trying to get him ready for it and we point at Rose's belly and we say, "Mummy's baby, mummy's baby", and he points at his tummy and goes, "My baby, my baby."'
Kit and Rose met while filming their hit HBO show Game of Thrones and began dating in 2011.
They announced their engagement in The Times newspaper in September 2017 and married the following June in Aberdeenshire, Scotland.
Rose was seen visibly pregnant in September 2020 and their son was first spotted in February 2021, though the couple have never confirmed when he was born.
Leslie admitted she found it 'brutal' being torn away from him when she was filming for the upcoming six-episode series of Game Of Thrones at the time.
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