One Direction love interacting with their Directioners, so they have meet and greets at almost every tour stop. And at a tour stop this weekend, Niall Horan spied a special guest in the meet and greet line ... Can you spot him, too?
That's right -- it was none other than Harry Styles, who somehow managed to go unnoticed. Can you imagine the shrieks once those girls turned around?
What would you do if a member of One Direction surprised you in line? Tell us in the comments!