Clarke Gayford took to Instagram to wish his partner, Prime Minister Jacinda Ardern, a happy 40th birthday.
"I don't really do these posts, but I think a bit of symmetry like the number 40 is worth posting on," he said.
"Happy Birthday today to my favourite achiever in the whole wide world, someone, who despite everything on her plate, still finds time to squeeze lots of fun, love and happiness into our wee family unit. The. Best. xx"
On the Labour Party's Instagram page, fans of Ardern also shared their birthday greetings with one saying: "Thank you for being born."