Beauty may well be in the eye of the beholder but, mathematically speaking, the world's prettiest face belongs to actress Amber Heard.

Using an ancient formula and face mapping software, a physician assessed women considered among the most beautiful in showbusiness, including Kim Kardashian, Scarlett Johansson and Kate Moss.

Harley Street surgeon Dr De Silva said the Greek ratio of Phi, which is 1.618, can be applied to a face to find the ideal proportions. The Greeks found the ratio everywhere in nature and he discovered that 30-year-old Heard, best known as the estranged wife of Johnny Depp, the closest to a perfect match.

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He used the "golden ratio", as it is known, in numerous calculations, such as the base of the nose, multiplied by Phi, should equal the length of the nose, and the length of the lips. Also the width of the face times Phi should equal the length of the face.

In Dr De Silva's formula there should also be an equal distance between the forehead, brow, nose and chin. He said it meant Heard had a 91.85 per cent match.

Kim Kardashian's face came second with 91.39 per cent, Kate Moss was third with 91.06 per cent, Blurred Lines model Emily Ratajkowski was fourth with 90.8 per cent, and Kendall Jenner was fifth with 90.18 per cent accuracy of her features to the beauty ratio Phi.

Kim Kardashian and Kate Moss came in second and third. Photos / Getty
Kim Kardashian and Kate Moss came in second and third. Photos / Getty
Kendall Jenner and Emily Ratajkowski were ranked fourth and fifth. Photos / Getty
Kendall Jenner and Emily Ratajkowski were ranked fourth and fifth. Photos / Getty