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."