The "Lights Up" hitmaker sent fans into a frenzy when he debuted the steamy cover, which sees the former One Direction singer showing off his toned and tattooed nude frame, with his legs propped up inside a giant heart.
The star struck a sultry pose for the camera using his hand and crossed legs to preserve his modesty, while in another stunning snap he flaunts his heavily inked torso as he poses in suspenders, pink trousers and a wide-brimmed hat.
When asked whether the star actually posed naked for the cover-art during an interview with the "Morning Mash Up" on SiriusXM Hits 1, he coyly responded "allegedly," before quickly clearing up the speculation.
The "Watermelon Sugar" singer, 25, added, "It's me and I am naked."
"Fine Line", featuring Harry's latest single Adore You, drops on Friday, December 13.