Tim Stack
August 14, 2009 AT 04:00 AM EDT

Leighton Meester
The Gossip Girl star takes this summer’s stripes to party-dress perfection with a flirty Louis Vuitton frock, expertly accented with bright red pumps. A

Cameron Diaz
Who says you have to be a teen to steal this show? Diaz puts the younger generation to shame in a smartly tailored Alexander McQueen. B+

Megan Fox
Her hair is fab — and we love a d’Orsay heel — but the color of the dress and the muted makeup add up to something Fox isn’t: bland. C+

Miley Cyrus
The skirt is too mini. The jewelry is too loud. The bra is too visible. Somewhere, Mickey Mouse is crying. And requesting a fashion intervention. F

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