Actress Jessica Alba has the sexiest wiggle in movies - according to a team of Cambridge mathematicians.
The academics say that the Fantastic Four beauty has the precise ratio between waist and hips for the ultimate sexy strut, reports the Telegraph.
This ratio provides the body with the right torso strength to produce a more angular swing and bounce to the hips during the walking motion.
They worked out that a 0.7 ratio of waist to hips - such as 36in hips and a 25in waist - should make a perfect sway, like Jessica's.Alba's wiggle beat off similar sashays from Desperate Housewife Eva Longoria, Tomb Raider star Angelina Jolie and even the sexy Marilyn Monroe.
While Monroe was a fraction off the target ratio with 0.69, the Cambridge team said that Alba had the perfect proportions.