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Rihanna - 2012
The "Diamonds" singer" was fairly subdued -- but still looked fab -- in this black crocodile frock by Tom Ford.

Memorable Looks From Met Galas Past

The annual Met Gala is like the Oscars of fashion. In anticipation of this year's stylish event on May 6, omg! takes a look back at some of the most interesting gowns the stars have worn over the years.