Meeta Agrawal
June 05, 2009 AT 04:00 AM EDT

Style report card

Who rocked MTV’s red carpet on May 31, and who went over the edge? We grade the looks.

Leighton Meester
We get it, Leighton — you’re no Blair Waldorf. And if that means more bold red-carpet risks like this daringly sheer Emilio de la Morena, then peace out, Upper East Side. A

Sienna Miller
If the glitz of the G.I. Joe star’s brief little backless number weren’t enough to dazzle, how about this: It comes from the actress’ own line, Twenty8Twelve. A-

Kristen Stewart
The Yigal Azrouël — with its pebbling and crisscross strapping — wanted to wow the crowd. Unfortunately, the Converse wanted to stay home. B

Lauren Conrad
She clocked time at Teen Vogue, worked as Kelly Cutrone’s styling minion, and started her own fashion line. So how on earth did this…situation happen? D+

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