Beyonce's White Roberto Cavalli Dress Was This Week's Best Look

Beyonce Knowles celebrated the 10th anniversary of husband Jay-Z's  40/40 Club in true style Monday night in a stunning white dress by Roberto Cavalli.

The dress was so cool, nobody else stood a chance of topping it this week -- but that doesn't mean they didn't try.

In the gallery, above, check out great looks from Kristen Wiig, Rosie Huntington-Whiteley and more of this week's best-dressed stars.

 

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