"Louis [is the most vain]," Harry tells Top of the Pops magazine. "Before we go on stage, he looks into every reflective surface, fixing his hair."
He even joked about the amount of product Louis uses to get his mane just right. "I have never seen anyone use so much hairspray," Harry adds. Well, at least all of that time and attention pays off — Louis does have a great head of hair.
Check out the above gallery to see 10 pics of Louis' perfect 'do. Which guy in One Direction do you think has the best hair? Vote in the comments.