Sexiest tummies in the World

R and B singer Rihanna has topped a new poll of the 'Sexiest Celebrity Stomachs in the World'. The survey results reveal that a sexy stomach isn't governed by age, which is good news for all those wanting to tone up or maintain a flat tummy. The 20-year-old Barbados-born beauty, Rihanna renowned for her revealing stage outfits, came first in the poll conducted by stomach-flattening supplement. (Reuters Photo/Jim Ruymen)

Second on the list was Keira Knightley, who is famous for wearing midriff-flashing costumes and who has bared her taut abs in movies including Bend It Like Beckham and King Arthur. (Reuters/Fred Prouser)

Sienna Miller, who showed off her enviable toned figure in a skimpy bikini while on holiday recently, shared the fourth spot with Liz Hurley. (Reuters/Fred Prouser)

British model-actress Elizabeth Hurley,wife of textile heir Arun Nayar stood fifth on the list. (Source: Rouge)

Rounding off the top five was Jemima Khan, an English socialite known due to her relationships as Hugh Grant's ex-girlfriend, the former wife of Pakistani cricketer Imran Khan, and a daughter of late billionaire James Goldsmith. (Reuters/Paul Hackett)