As of right this second, at least.
In the new pictures released just today in honor of her little boy's first birthday on Tuesday, the glowing mum is wearing a green-and-white-print Budding Heart silk tea dress by Suzannah, one of Kate's go-to English brands.
The dress retails for $811 (or 475 pounds) online and the site offers shoppers the option of trying the frock on at home and exchanging or returning it for free if it doesn't quite fit.
Cut in a 1930s-era retro style at the bust and waist with smock detailing, the short-sleeved dress looks as though it would complement a number of body types, not least of them Kate's royally fit figure.
The print was designed in Como, Italy, and translated into material exclusively for Suzannah.
Billed as "a fabulous day dress" to be styled up or down, the Budding Heart is made of matte silk crepe de chine, the skirt lined in 100-percent silk habotai and hitting just below the knee.
While Kate's feet aren't visible in the sweet pics released today, if she's not wearing trainers for comfort (who knows how many frames the family posed for!), she's likely wearing peep-toe heels or otherwise neutral pumps.
As for the royally adorable occasion, Will and Kate will celebrate George's birthday tomorrow at Kensington Palace with an intimate party. Prince Harry and Queen Elizabeth II are on the guest list, as is Auntie Pippa Middleton.
"We would like to take this opportunity on George's first birthday to thank everyone over the last year, wherever we have met them, both at home and overseas, for their warm and generous good wishes to George and our family," the proud parents said in a statement released with the official photos.
"He was very lively, very confident and very sure of himself," photographer John Stillwell said about working with the little prince. "He's a very determined young boy. And who does he look like? I'd have to say his dad, William."