And fellow Irishman Brian McFadden had better watch out!
Westlife singer Kian, 35, is NOT happy that former bandmate Brian, also 35, has formed Boyzlife with Boyzone star Keith Duffy.
The musician told Dublin's 98FM that he'd been left "scratching his head" at the news.
The Voice Ireland coach said: 'It was really unfair on the fans that everybody thought that this was what's happening, you know that Westlife and Boyzone were getting together to do a tour."
As if his annoyance wasn't clear, dad-of-two Kian continued: "'From the perspective of someone who spent 15 years in Westlife it was really aggravating.
"It's a bit of an odd one - a member of Westlife who left the band after four years decides to use half the name for whatever it is that they're doing."
Naturally, outspoken Brian wasn't going to take the criticism lying down and hit back during an appearance on the Late Late Show on RTE.
The Jump star said: "I was actually in Westlife for more than four years but maths was never Kian's thing in fairness."
Keith, meanwhile, said: "At the end of the day myself and Brian are after teaming up to do a show and talk about 20 years in the business.
"All the performances we do will be in a Hilton Hotel all across the UK and Ireland. A saucer of milk for Kian please."
Westlife formed in 1998, with Brian leaving six years later. The rest of group disbanded in 2012.
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