Smith and his partner Teagan Voykovich announced the news their baby son was born yesterday on social media today, with Smith posting on image of himself carrying his baby son down a hallway in the hospital.
The pair announced their engagement in March while Smith was on an injury enforced break from playing for the Highlanders.
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After being part of the All Blacks side to lift the Webb Ellis Cup in 2015, Smith will be seeking his second World Cup title in Japan next month.