WARNING: If you don't want to see the derrière of a pop star, click away! OK, you're still here. That's what we thought... The One Direction boys are known for their crazy number of tattoos, but the only member of the band who doesn't have any ink is 19-year-old Niall Horan. However, all that changed after the blond, blue-eyed hunk appeared with his bandmates on One Man, Two Guvnors star James Corden's U.K. comedy show A League Of Their Own. As you can see in the video below, Horan now has a temporary tat of buddy Corden (who co-wrote the hilarious video for 1D's current single "Best Song Ever") decorating his backside. BONUS: Corden also managed to suck face with sexy, mop-topped band member Harry Styles. We now have a new favorite show. Enjoy!