47. Kate Beckinsale in Marchesa
If you're going to wear a ball gown with miles and miles of frothy tulle, you might as well do it at the Met Gala. Kate Beckinsale went for all-out, over-the-top glamour at the 2010 event in a steel gray gown by Marchesa with a sparkling bodice and a very full skirt with a train. We imagine it was probably hard to sit down in this dress, but when you look this fabulous it's definitely worth it.
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