"Neve requested a Ladybug, and after several disasters underneath A LOT of icing, this was the result."
The result was impressive - but as the PM revealed, not all of the cake was actually edible.
"All edible aside from the eyes (I resorted to sharpie on lollipops)," she contined. "Happy Birthday Neve Te Aroha!"
As mum to a 4-year-old, Ardern is no stranger to the tougher side of parenting. Earlier this week, she shared the very relatable experience of being up multiple times with a child who refused to sleep.
"In the office kitchen making the strongest tea possible pre my morning media round and wondering how many other parents have a 3 year old that suddenly gets up ALL THROUGH THE NIGHT! Tips welcome," she wrote on her Instagram Stories.
The caption was posted above a selfie of Ardern, ready to start her work day.
It is not the first time the Prime Minister has taken to social media to share the realities of parenthood in general - and the intricacies of getting children to stay in bed, in particular.
Back in November, Neve made a special appearance (albeit off camera) in one of her mum's live Facebook videos.
For more parenting stories, listen to the NZ Herald's new parenting podcast, One Day You'll Thank Me