Ambrosio, 31, walked the red carpet with her longtime love Jamie Mazur and their daughter Anja, 4, and son Noah, 5 months.
Meanwhile Romijn, 39, was joined by her husband Jerry O’Connell and their twin girls Dolly and Charlie, both 3.
Zoe, 41, was perhaps the most fashionable of the attendees, thanks to her stylish and adorable guest: her 1 and 1/2 year-old son Skyler, who sported a navy blue mini blazer and fedora.
Who else showed up for the star-studded affair?
The event also served as a reunion site for newly separated parents Selma Blairand Jason Bleick, who brought their one-year-old son Arthur.
Click through the gallery above for photos of these famous families at the Veuve Clicquot Polo Classic.