While some say beauty is in the eye of the beholder, science proves that may not always be true.

It's nice to believe your significant other is the most gorgeous person in the world, but there's a formula to prove they are not.

Called the "golden ratio," this mathematical equation is used to map out physical perfection of an individual based on the symmetry of their face. It was created by Ancient Greeks, and was used by Leonardo Da Vinci for Vitruvian Man, his famous portrayal of the perfect male body. While I wouldn't recommend you try it on yourself, that doesn't mean you shouldn't use it on your favorite celebrities.

Doctors used the golden radio to judge of the female British royals, which led to not-so-surprising results.

They used the faces of Meghan Markle, Kate Middleton, Zara Phillips, Princess Beatrice and Princess Eugenie, and determined Prince Harry's future bride had the most "perfect" face, with an 87.4% score.

But how did they calculate that?

Well, according to Harley Street surgeon, Dr. Julian De Silva, it all comes down to the position of your facial features, rated out of a 100 point scale.

"Meghan has beautiful facial symmetry and gets closer than any other princess to having what the Greeks considered the perfect face," De Silva said.

"Meghan has an almost perfectly shaped nose with a 98.5% score, her eye position is exactly right and her gorgeous V-shaped chin is far more classically beautiful than Kate," he added.

But how did the other royals stack up?

Coming in second place was the Duchess of Cambridge, who had an expected score of 86.8%.

"In a very tight race, the Duchess was beaten by Meghan by the narrowest of fractions. Kate stands out stands out for having a perfect gap between her nose and lips and very strong eye spacing," De Silva said. "She was marked down for having a weaker chin and jawline than Meghan."

The plastic surgeon said while the other three royals are beautiful in their own right, they are lagging behind Markle and Middleton's high rankings.  

"The other three princesses all received high scores but were a little further away from Golden Ratio perfection than Meghan and Kate," De Silva explained, handing out an 81.6% to Phillips, 80.7% to Beatrice, and 78.3% to Eugenie.

"Princess Eugenie had by far the lowest mark for her lips at 68.3% - 12 points behind any of the other princess. She is a very pretty woman and scored well in other areas such as eye positioning," he said.

De Silva said he used the formula with the help of brand new computer mapping techniques, which along with rating someone's beauty, is also helpful when planning a patient's surgery.

"The Phi ratio of 1.618 has long been thought to hold the secret of beauty, and now with the computer mapping we can calculate exactly how it applies to all the royal princesses," the doctor concluded.

Who do you think is the prettiest royal?

[H/T: Daily Mail, The Sun]