Liam Payne's 21st birthday seems like an international holiday that we've been looking forward to for weeks now. It's such an exciting day for the One Direction singer, so in honor of his milestone birthday, we took a look back on 21 of his biggest hair moments ever. Even as a tiny tot, Liam had amazing hair, and has experimented with tons of stylish hair looks ever since!
Click through the gallery above to see flashback pics of how dramatically Liam's hair has changed over the years. Then, wish him a happy birthday in the comments section below!