Thought you'd seen Kate's dazzling Jenny Packham dress before - well, a certain Gossip Girl got in on the action first....
It's a case of a Park Avenue princess versus real life royalty in today's who wore it best, as Leighton Meester takes on our very own Kate Middleton.
If you thought you'd spotted the Duchess of Cambridge's dazzling Jenny Packham dress before, then you're probably a Gossip Girl fan, as the lovely Leighton slipped into a very similar design by the designer for scenes as her small screen alter ego, Blair Waldorf.
In TV mode, Ms Meester wore a knee-grazing number with intricate silver beading.
Kate chose a floor-skimming number at the Ark charity gala - her first big glam night out since marrying her Prince - and accessorised with an L.K. Bennett box clutch and bow-back heels. Her now signature glossy locks, styled in soft waves proved the perfect finishing touch.
So there's the evidence style fans - but who reigns supreme as today's fashion queen? Take your pick and let us know your verdict in the comments box below...