Well, for now (until maybe some after party pics come out?)...
Best:
Reese Witherspoon in Stella McCartney
Kate Bosworth in Stella McCartney
Leighton Meester in Pucci
Emma Stone in Thakoon
Liu Wen in Zac Posen
Arizona Muse in Zac Posen
Rachel McAdams in Ralph Lauren
Worst:
Shailene Woodley
Rita Ora
Elizabeth Olsen
Brie Larson
Kate Upton
Maggie Gyllenhaaal
Nicole Richie
Best couple: The Beckhams, followed by Diane Kruger & Joshua Jackson