They're young, they're talented and they're major trendsetters!
According to the Wall Street Journal, the Biebs and the Harry Potter star had "the fastest-rising searches for celebrity haircuts on Google."
And while Emma went through some growing pains as her locks adjusted to its dramatic new length in 2011, the 21-year-old actress quickly worked it out and has been seriously rocking her adorable pixie cut all year long.
Do you think these young stars had the best hair of the year? Weigh in below!