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!!!
Designer Peter Soronen broke the news during a panel discussion in New York this week, telling the audience: "We heard that she's gone already. So I'm not even sure who it is right now".
The White House hasn't commented, but it wouldn't be completely surprising since Koop was supposedly responsible for putting MObama in that controversial McQueen gown.
[Image via Getty Images.]