The blonde actress, who has been the face of the brand for several years now, poses in new campaign images with her adorable relatives.
"My brother brings my nephews over to my house a lot, and all the kids get along so well," the star explained to WWD about the adverts.
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"We have a very, very close family, so for them to be here today and enjoy this process with me and to be able to see them on Madison Avenue in these pictures is going to be a lot of fun."
The campaign was shot at a private home in Beverly Hills. Kate is the picture of elegance in a monochrome ensemble as she plays with the two boys while they bake in the kitchen.
The other six images show Kate posing solo in various outfits from the brand. Talking about family life, Kate added, "It's all a little bit about how I live and a lot about howwomen live every day.
"As working mums, we're all just figuring it out as we go, right? But if I were to offer my advice, I'd say, Try to be present. When you're at your job, be 100 per cent committed to it and do the very best you can. And when you go home at night, leave all the work behind and show up completely for your family. That's the best part of your day, so really be there."
The ads, shot in a domestic setting, are in keeping with her sentiments, bearing positive inscriptions such as, "We live, work, and play in the moment".
Other sentences to accompany the images include, "We're fluent in fashion and other romance languages," and "We believe life is one part style, one part substance and we love the classics, but break with tradition."