The 'Rollercoaster' hitmaker proposed to his girlfriend, TV executive Storm Uechtritz, 34, in April, and has revealed they've launched themselves into planning their nuptials which will take place at the "end of summer".
He told BANG Showbiz: "We'll be getting married this year. We're very excited, I can't wait. I'm very lucky and it's a big year for us."
The 38-year-old musician - who finalised his divorce from his first wife Yvonne Connolly, who he wed in 1998, earlier this year - admitted organising the ceremony has been a much bigger task than he first expected.
He explained: "We're putting it all together now, it's a huge task. I had no idea what a mammoth task it is, but it's all going well and we're very excited."
Ronan, who rose to fame in Irish boyband Boyzone, added he would be "annoyed" if his bandmates Shane Lynch, Keith Duffy and Mikey Graham fail to show up to see him tie the knot.
When asked if his pals would be attending, he said: "They better be! I'd be annoyed at them if they aren't."
And although the singer/songwriter - who is set to complete a stint on Magic Radio next week - already has kids Jack, 16, Marie, 14, and Ali, nine, from his first wife, he revealed he "absolutely" wants to have children with Storm, who he has been dating for three years.
When asked if the couple will have a baby together, he replied: "Maybe, yeah, absolutely. We'll see where the road takes us, but yeah of course. We're very, very happy together. She's an incredible woman. I'm a lucky man."
Ronan Keating joins Magic Radio to present their 'Magic in the Morning Breakfast Show' from 15 - 19 June.