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.