Popsugar Beauty Justin Bieber Justin Bieber's Best Hairstyles From "Baby" to Babe: The Evolution of Justin Bieber's Incredible Hair April 4, 2016 by Emily Orofino View On One Page Photo 18 of 21 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 18 2015 For his appearance at the 2015 American Music Awards, Justin left his hair long and blond on the top while razoring down the sides for a trendy undercut. Previous Next Start Slideshow Justin BieberCelebrity HairCelebrity BeautyHairMen's Grooming