Krista Kennell/Sipa

WHAT SHE WORE Dianna Agron hit the I Am Number Four premiere in a draped Vivienne Westwood dress, accessorized with red satin Brian Atwood heels and a corseted VBH clutch.

WHY WE LOVE IT In a word: pretty. The Glee actress radiated femininity in barely-there blush tones and a loose side-swept updo.
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Dianna Agron

Dianna Agron in Vivienne Westwood