Emma Watson

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WHO: "Harry Potter" star Emma Watson.

WHAT: Watson paired her Oscar de la Renta gown from the designer's Fall/Winter 2011 collection with a starch white blazer by Antonio Berardi. She completed her evening look with topaz drop earrings.

WHERE: Trafalgar Square in London on July 7.

WHY: The actress was attending the world premiere of "Harry Potter and the Deathly Hallows Part 2."