Natalie Portman Dons Dior

The actress wore a modern-day ballgown at the premier of “Thor”

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Natalie Portman attends the "Thor" premiere in Dior. Photo by Getty Images.

Natalie Portman Dons Dior

The actress wore a modern-day ballgown at the premier of “Thor”

Who: Natalie Portman

Where: The world premiere of “Thor: The Dark Knight” in Leicester Square in London.

When: Tuesday, October 22nd

What: A black cashmere top and metallic jacquard skirt, both by Dior.

Why: Long, ball gown-style skirts can be overwhelming on diminutive figures. Portman nails the proportions by balancing the full, ornate skirt with a simple black sweater.