Even some of the most famous faces of went to high school before their incredible success ... not keep the big poufy hair for long after this yearbook photo from 1979 was taken.

An analysis of nearly 38,000 American high-school yearbook photos from the 1900s to the 2010s shows the gradual shift from serious to lighthearted expressions, reports Steve Dent for Engadget.

Zendaya's high school photo is going viral again nine years after the fact ... "she's been serving all the way from HS" zendaya’s senior yearbook picture is so insane pic.twitter.com ...