Clarke Gayford's wish for his 'favourite achiever' partner Jacinda Ardern on her 40th birthday

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"

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I don't really do these posts, but I think a bit of symmetry like the number 40 is worth positing on. 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

A post shared by Clarke Gayford (@clarkegayford) on Jul 26, 2020 at 1:00am PDT

On the Labour Party's Instagram page, fans of Ardern also shared their birthday greetings with one saying: "Thank you for being born."

Finance Minister Grant Robertson and Justice Minister Andrew Little were among the first people to publicly wish Ardern happy birthday on her special day.

"Happy birthday to Labour Leader and Prime Minister Jacinda Ardern," Little posted on Facebook.

"She was surprised with a cake and birthday singalong at Newton Markets yesterday."

Also attached was a video of the singalong and a surprised Ardern thanking everyone and cutting the cake.

Robertson posted on Instagram along with a few snaps of the pair together.

"There have been good times, crazy times and sad times but it's always been my honour to stand shoulder to shoulder with my friend @jacindaardern," he wrote.

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There have been good times, crazy times and sad times but it's always been my honour to stand shoulder to shoulder with my friend @jacindaardern Happy 40th birthday!

A post shared by Grant Robertson (@grantrobertsonmp) on Jul 25, 2020 at 2:07pm PDT