Wet Kisses & Butt Tatts! Watch One Direction's Harry Styles and Niall Horan Get Cheeky with Tony Winner James Corden by Ryan Gilbert

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&n…

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