The X Factor Australia judges posed for a series of saucy snaps for WHO magazine's Sexiest People of The Year 2013.
While Aussie brothers Chris and Liam Hemsworth are often considered Hollywood's hottest pair and Australia's sexiest exports, they are nowhere to be seen on the playful cover.
In the pictures, the scantily clad judges get up to all sorts of high jinks -- jumping in the air, battering each other with pillows and laughing uproariously.
In another shot, the judges languish across a king-sized bed and stare longingly at the camera.
Ronan has been hitting the gym in preparation for Boyzone's 20th anniversary tour and is in tip top shape.
And blonde bombshell Natalie and brunette Dannii don't look too bad either; the two ladies flaunt their enviable figures in lacy negligees and knickers.
He may be in bed with two of Australia's hottest celebrities but loved-up Ronan only has eyes for his girlfriend Storm Uechtritz.
"My girlfriend rocks my world," he says. "That's for sure. She's incredible. She's confident, comfortable in her own skin, has a hell of a sense of humour. We laugh a lot -- that's what gets me through the day."
And Storm appreciated the shots, saying it was her "favourite cover ever".
Ronan (36) has been through a lot of ups and downs in the past few years. His marriage to Yvonne came to an end in 2011.
But the Life is a Rollercoaster singer says he's now in a much better place.
He said: "I'm at a point where I'm starting to really understand who I am. I'm 36, got three kids and have been through a lot of ups and downs.
"I've learned that I'm human, I can make mistakes and I'm not perfect. But you dust yourself off and you try to be the best person you can be.
"And you know what? I'm very lucky. I've got healthy kids, got a great lady by my side. Life is good!"