Last night was a tale of two fashion cities: Paris and London. From Kate Moss's tuxedo jacket perfection at The Serpentine Gallery Summer Party to Olivia Palermo's high-shine number that she wore on the Valentino Haute Couture FROW, the A-listers hit the party circuit with chic aplomb! And then there's Aymeline Valade's achingly cool dress that redefined sexy. Not to mention the crème de la crème from the blogging world at the Love Ball, and, boy, did they raise the sartorial bar. Oh, what a night! Warning: These photos may inspire a spending spree on party apparel, so prep your consumer wits.