Comedienne Ellen Degeneres has commissioned Jessica Alba to help develop her walk after learning the actress has the world's sexiest stroll. British experts claim Alba has the "perfect walk" after conducting a scientific study based on the ratio between her hips and waist. So, when Alba appeared on DeGeneres' talk show on Thursday (20Sep07), she insisted the embarrassed actress teach her how to develop a "sexy swagger". Reluctant Alba, who has called the study "silly", agreed - and took a walk with DeGeneres, stating, "I don't understand." In the study, the Cambridge boffins determined the "ratio" provides the body with "the right torso strength to produce a regular swing and bounce to the hips during the walking motion." They added, "Therefore a woman with a 25-inch (63.5 cenitmetres) waist, and 36-inch (91.4 centimetres) hips would have just the right proportions to carry out a sexy swagger as she walks."