Celebrities love switching up their looks, and it's seriously crazy what just one year can do to someone's appearance. Some of your favorite famous guys have totally transformed in 2016, by growing beards, wearing their hair completely differently, and well, growing up!
Stars like Niall Horan, Harry Styles, Jack Griffo, Peyton Meyer and more have all shocked fans with some major makeovers this year – and now that 2017 is quickly approaching, we're rounding up some of the biggest transformations guys have made in 2016.
Click through the gallery to see how much these cuties have transformed from the beginning to the end of 2016. Then, drop a comment telling us which guy you think changed the most over the course of the year.