Happy 21st Birthday Harry Styles! In celebration of Harry's very big day the One Direction team has started Hats On For Harry.
As part of the birthday celebration event fans have been asked to honor Harry and his hat obsession by sporting their own favorite hat and snapping a selfie! The 1D Twitter account shared, "It's Harry's birthday on Sunday. He likes a hat, so .... get your #HatsOnForHarry and share a pic with us!"
Click through the gallery to see some of Harry's most famous hat pics, and let us know if YOU snap a selfie with your own hat style!