Researchers have determined that women whose upper and lower lips are exactly the same thickness are deemed to have the most desirable pouts. And Scarlett Johansson hits the perfect ratio of 1:1.

However, former Harry Potter actress Emma Watson is deemed less than perfect as she has a slightly narrower upper lip.

The findings come from a study of 560 plastic surgeons and the same number of members of the public, drawn from 35 nations. They were asked to look at photographs and choose those with most attractive mouths.

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