Zac Efron on set in Georgia on April 27 (not to worry, it's fake blood!). The crop top fad first started in women's wear in the '80s (think Madonna, Flashdance) and then had a midriff-filled resurgence in the late '90s thanks to the Spice Girls, Britney, Christina, and others. After a hiatus of about a decade, the cropped look returned with a vengeance in the summer of 2013—Rihanna, Miley, et al—and translated into some surprisingly chic runway iterations. Just when we were starting to get…
