Kit Harington and Rose Leslie have announced they are expecting their second child.
The 36-year-old revealed the exciting news during an appearance on The Tonight Show with Jimmy Fallon.
The actor was talking about his son, whose name has not been made public, when he confirmed the news.
Kit said: "He is about the get the shock of his life, which is that he's about to get a brother or sister."
He then went on to confirm Rose is pregnant with their second child, saying he's scared of welcoming another baby.
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 went on to explain that he and Rose have been trying to explain to their son 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 first met while filming their hit HBO show Game of Thrones and began their relationship in 2011.
Their engagement was announced in The Times newspaper in September 2017 and they tied the knot the following June in Aberdeenshire, Scotland.
Rose was seen pregnant with their first child back in September 2020 and their son was first spotted in February 2021.
However, the couple have never confirmed when he was born and tend to keep him out of the spotlight.
Kit rose to fame starring in Game Of Thrones and could be returning to the popular show.
His role earned him an Emmy nomination as well as being one of few characters that survived from the pilot episode to the end.
Since leaving Game of Thrones, Kit has starred as Dane Whitman in the 2021 Marvel Studios movie Eternals.