Rihanna Adds 'Sexiest Tummy' To Her Best Legs And Hair Prizes
Her tight abs earned her the top spot in a poll conducted by the makers of digestive aid supplement AntiBloat.
Second on the list was slender actress Keira Knightley, renowned for wearing midriff-flashing costumes in movies such as Bend It Like Beckham and King Arthur.
In third place was Helen Mirren, who wowed onlookers last month with her chiselled midsection as she stepped out in a bikini while on holiday in Italy.
Sienna Miller and British model/actress Elizabeth Hurley shared fourth position to round out the top five.
Click the pics for Rihanna's gallery:
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