In a post shared on Instagram, Ardern showed the 'Meri Kirihimete' cards which feature the work of Rosie, the three-year-old niece of her partner Clarke Gayford.
One of the cards is addressed to Her Majesty The Queen and The Duke of Edinburgh.
The Prime Minister also joked that her Christmas card list is a little bigger this year.
Gayford's nieces Rosie Cowan, 3, and Nina Cowan, 5, accompanied the Prime Minister to her swearing-in ceremony at Government House in October.
Over the weekend, Ardern took part in a photoshoot for US Vogue magazine. She is expected to be wearing NZ designers in the feature for the March issue of the "fashion bible."
WATCH: Scroll down to watch a video of Jacinda Ardern talking to NEXT magazine about her plans before she became leader of the Labour party.