Sarah Jessica Parker pays homage to the Brit designers—rocking a Vivienne Westwood dress, Alexander McQueen jacket and blue Nicholas Kirkwood stilettos—in this dark ensemble that would fit right in at Hogwarts. But her best accessories are Matthew and No. 1 Potter fan James, who is adorbz in a tartan tie (and did you hear him talk up how excited he was? too cute). What a gorgeous fam!