We officially can't decide which is more popular: Pharrell Williams' infectious song "Happy," or his now-famous oversized hat! We're not the only ones who can't get enough of the fun trend, our fave celebs are having a total blast copying Pharrell's signature look!
Liam Payne and Ed Sheeran both stole Pharrell's iconic topper for cute Instagram selfie purposes this weekend – Ed literally swiped the hat off of Pharrell's head while he was hanging out with him at the studio! Stylish guys like Harry Styles and Justin Bieber have even snagged some style inspiration from the headpiece that has clearly started a fashion frenzy.
Click through the gallery to see 15 stars who have worn hats just like Pharrell's. Who do you think rocks the look best? Tell us what you think in the comments section below.