Madonna and husband Guy Ritchie have been voted the best-dressed celebrity couple.
The pair beat David and Victoria Beckham and 'Sex AndThe City' star Sarah Jessica Parker and Matthew Broderick in the poll.
Hollywood couple Brad Pitt and Angelina Jolie, whose relationship is rumoured to be going through a troubled patch, came second for their 'smouldering' red-carpet look.
New Los Angeles residents Posh and Becks were third in the survey of 7,000 fashion fans for In Style magazine.
Singer Gwen Stefani and her rock star husband Gavin Rossdale were fourth, followed by actress Demi Moore and her younger husband Ashton Kutcher, for their 'complimentary' wardrobe.
Actress Kate Winslet and director Sam Mendes are sixth, while Sarah Jessica Parker, famous as Carrie in 'Sex and the City,' and her actor husband Matthew Broderick are seventh.
'Batman Returns' star Kate Bosworth and British model James Rousseau make it into eighth place.
Katie Holmes - who has received fashion advice from Posh Spice - and Tom Cruise also made it into the list, in ninth position.
Despite Kelly Brook's disastrous appearance on the red carpet for the premiere of the film Snatch, when she wore a pink crystal-encrusted dress with matching knickers, the British TV presenter and actress is 10th, with fiancee Billy Zane.