The ladies have been BFFs since forever so it's no wonder they teamed up together for Stella's starry ready-to-wear collection which launches in September.
The vibe is whimsical, set against a backdrop of forests, the cosmos and glaciers where La Moss models signature sash dresses, geek-chic eyewear, dreamy accessories (the new Cavendish bag) and oversized woollen outerwear.
This isn't the first time Stella has tapped Kate for a modelling gig either, the new campaign is the seventh featuring Kate, though the last time they collaborated was back in 2009.
"Kate epitomises the Stella McCartney woman, and I wanted to capture her dreams and the moments we have shared over the years" the designer said.
"I wanted to escape into something surreal this season and fashion should make us dream, sometimes."
So, winter dressing according to Stella is all about the mystique. Think dreamworld, think tie dye, star print, woodlands, embellishment and swirly line detailing.
We love this "Kate Dreams" concept - because who doesn't want to wear top-to-toe Stella?
With price points that start at £120 (for a bobble hat) and go up to £3,690 (the luxe, lace-trim Camelia jumpsuit) the majority of us will have this collection down on our never-going-to-happen wish list.
LOVE THIS DESIGNER? Take a look back at the full Stella McCartney Autumn/Winter 2014 catwalk presentation from Paris Fashion Week.