But the design is so classic that it's super easy to find without resorting to dropping major cash for the Tom Ford original!
We found two equally affordable options that are super similar to Kate's dress.
Check 'em out ...AFTER THE JUMP!!!
Good thing this took place after the kiddos' bedtime because this look is not suitable for kids under the age of 13!
The Project Runway hostess hit the carpet in a not so kid-friendly KaufmanFranco sequin halter gown with mesh detailing that revealed her panty-free bod!
We're not crazy about the super casual hair and makeup, but with a bangin' bod like that, we almost forgot to even look anywhere else!
Way to distract us in the best way possible, Heidi!
[Image via Dimitrios Kambouris/Getty Images.]