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!!!
The 11 month old big sister-to-be stole the spotlight from her mommy, who showed off her growing belly in a burgundy dress from the Jessica Simpson Maternity collection, while sitting on the table between autograph signings and flashing her cute pout.
She definitely got it from her mama!
And if we didn't know any better, it looks like Maxwell's 'do was heavily inspired by Auntie Ashlee's stylish bun.
[Image via Getty Images.]