By EMILY CEGIELSKI
You're correct, if you guessed Kevin Jonas! The actor, musician and oldest Jonas Brother was quite the cute tot before making People's 'Sexiest Man Alive' list in 2008.
In honor of our favorite social trend, we've gathered some of the best #TBT photos of the day from Twitter and Instagram. From rock stars and athletes to NASA's amazing throwback photograph, taking a peek into the past has never been more exciting. Check back as we update our slideshow throughout the day.
If you guessed it was Brooke Shields in the above photo, then you're right! The actress was trying to shed her 'image as a wholesome Hollywood ingenue' when she agreed to be photographed as a man for PAPER's October 1990 issue.