In June last year, the pair became parents to daughter Neve Te Aroha, making Ardern the second Prime Minister in history to give birth while in office. The first was the late Benazir Bhutto, Pakistan's two-time Prime Minister.
Gayford, who is referred to as the "first bloke" in New Zealand, took time off his job as host of a fishing TV show to care for the child.
He has previously said his responsibilities in the relationship include making sure Ardern doesn't have lipstick on her teeth, reminding her to take her vitamins and eat proper dinners when she can.
In January, Ardern, when asked by the BBC if she would ever propose to Gayford, said: "No I would not ask, no. I want to put him through the pain and torture of having to agonise about that question himself."
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