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!!!
She may play the younger Carrie Bradshaw on The Carrie Diaries, but AnnaSophia Robb was all about that mid-80s Madonna swagger on Thursday.
The 19-year-old attended the Material Girl and Macy's Madonna Iconix Fashion retrospective in Century City in a cute print dress from Madge's Material Girl line worn with multicolor sandals and a Rebecca Minkoff spiked bag.
Her pink bra strap details, tousled dirty blonde bob, and baby pink lipstick were clearly an homage to the Borderline video.
We love a girl who knows her Madonna videography!
[Image via Getty Images.]