J.K. Rowling vs. Rihanna
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J.K. Rowling 
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Rihanna
Credit: Mike Marsland/WireImage; TIMMS-MARINER/XPOSUREPHOTOS.COM
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J.K. Rowling vs. Rihanna
No wilting flowers here! The Harry Potter author, posing in London, and the singer, rocking the red carpet in London, both donned Oscar de la Renta. ($11,990, 212-288-5810)