Funded by hotel giants Hilton, the exciting collaboration will see the two 90s heartthrobs come together to perform a medley of their top hits, including Love Me For a Reason and Flying Without Wings.
The duo will be hitting the road later this year, opening in London in October (16), before performing eleven more shows across the UK.
The pair, who were one time chart rivals, hope that the merger will lead to a full world tour with all members of the two groups.
"We could end up adding more people to the next one," Brian told the British Sun newspaper. "Right now this is about me and Keith, but the door is always open."
There has been speculation about the super group in recent months after Boyzone's Shane Lynch, 39, shared a photo of the two bands on Twitter.com.
The boys would be following in the footsteps of British group MCBusted, formed of MCFly and Busted, who went on to perform a sell-out UK tour and have a top 10 album.
Brian said: "We all had a chat (at Ronan Keating's wedding last year), the lads. We said it would be amazing. Not even just performing together, but can you imagine the craic (fun)?
"Nine of us Irish lads on a tour bus together, going round the world together. It would be absolute carnage. We all get on so well so you never know."
There are hopes that there could be future projects from the Boyzlife dream team, including writing new songs together and a TV documentary.
"There's no limit to this. We're going out there with our ears and eyes open," Keith said.