Helen Mirren's sexy stomach

Actors Helen Mirren and Forest Whitaker are seen at the end of Georges Chakra's haute couture autumn/winter 2008-2009 show in Paris July 1, 2008. [Agencies]

Dame Helen Mirren has one of the sexiest celebrity stomachs in the world, according to a new survey. The 63-year-old actress - who recently wowed onlookers with her trim physique when she donned a bikini while on holiday in the Italian Riviera - came third in the poll, which was carried out by stomach-flattening supplement AntiBloat.

AntiBloat spokesperson Jalal Janmohamed said: "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." 'Umbrella' singer Rihanna topped the poll.

The 20-year-old Barbados-born beauty is renowned for her revealing stage outfits and shocked fans with a variety of bondage-style costumes during her tour earlier this year. British actress Keira Knightley came second in the survey.

The 'Pirates of the Caribbean' star is famous for wearing midriff-flashing costumes, and has bared her taut abs in movies including 'Bend It Like Beckham' and 'King Arthur'. Keira's 'The Edge of Love' co-star Sienna Miller - who showed off her enviable toned figure in a skimpy bikini while on holiday recently - secured fourth place on the list.

AntiBloat's Sexiest Celebrity Stomachs, top six:

1. Rihanna

2. Keira Knightley

3. Dame Helen Mirren

4. Sienna Miller and Liz Hurley

5. Jemima Khan