A London School of Economics study finds that, in general, attractive people have higher IQs as well.

The report—which included 52,000 people from the U.S. and U.K.—shows that good-looking men have IQs that are 13.6 points above average, while pretty women have scores 11.4 points above the norm.

Lead researcher Satoshi Kanazawa explained his findings in this article from  The Sun:
"If more intelligent men are more likely to attain higher status, and if men of higher status are more likely to marry beautiful women, then, given intelligence and attractiveness are heritable, there should be a positive correlation between intelligence and physical attractiveness in the children."

But he warned his findings were statistical and should not be applied to individuals.

He said: "It goes without saying that our contention that beautiful people are more intelligent is purely scientific.

"It is not a prescription for how to treat or judge others."