Liam teased the photoshoot earlier this year, showing off his pert buttocks on Mert's Instagram.
At the time, Mert explained it was part of an upcoming project.
The photographer, captioned the post: “Get off my chair @liampayne #berlin #comingsoon.”
Opening up about the experience, Liam has now said: “Sometimes you get naked. It's normal. I love taking pictures of my body.
“Mert's picture was amazing. We've taken more pictures that should come out soon, but I'm super comfortable with my body.”
Fans were proud of his body confidence, praising the singer on Twitter.
“Ohh I love to read this. He has gained so much confidence and I’m so happy for that,” wrote a fan.
Another added: “I love a healthy king!!! Seeing him thrive makes me so happy.”
“Waiting for more of this.”
The sexy new photoshoot was inspired by famous model Kate Moss, who had a near-identical photoshoot with Mert Alas.
The photographer has worked with Liam previously for his collaboration with Hugo Boss as a global brand ambassador.
Liam's photoshoot is "coming soon," but as for his brand new single "Stack It Up", it's officially out now!
We're so here for this journey Liam is on.