The toddler, who is about to become a big brother, is constantly documented on the pair's Instagram accounts, already a media sensation in his own right.
When asked about sharing their family - and son - so publically, Hamish answers, "The simple answer is, you share what you're comfortable sharing and then you keep probably 99.9 per cent private."
Zoë continued, saying, "Hamish has always had a radio show where he's very open with his listeners, and I have been a blogger and a writer for a long time so we've always been very open talking about our lives, our relationships and everything, so I feel it would almost be unnatural, in a way, to not include our family."
Hey, we're not complaining.
This article previously appeared on marie claire.