The band lost Marti Pellow last year, as he vowed to shift focus to his solo career.
Now, Liberty X star and The Voice UK winner Kevin Simm has taken his place.
The group posted on Twitter: “Graeme, Tommy and Neil are delighted to welcome Kevin Simm as the new singer of Wet Wet Wet.
“We will be playing two intimate shows at @stlukesglasgow on 16th Nov and @229thevenue London on 20th Nov 2018.”
Wet Wet Wet have been active since the early 1980s, and are best known for their cover of The Troggs’ hit Love Is All Around.
That song spent 15 weeks at Number One on the UK charts; the second-longest stint at the summit in history.
Simm, 38, competed on Popstars back in the year 2001 and missed out on a spot in the short-lived band Hear’Say.
But the runners-up formed the group Liberty X, who went on to have success that lasted much longer; including a No1 smash with Just A Little.
Simm took part on The Voice UK in 2016 and was the final winner before it jumped from BBC One to ITV; under the mentorship of Ricky Wilson.
Solo success, however, was not forthcoming: his album Recover failed to reach the Top 100. He went on to release an EP independently called Love and Pain late last year.
He said in a statement: “I was really taken aback, the opportunity to join a band with such amazing songs and great guys and a great fanbase really excites me.
“When I first started gigging around the pubs and clubs up North two songs that were always in my set were Goodnight Girl and Love Is All Around.”
Pellow, meanwhile, is touring next month, after walking out of Wet Wet Wet in the summer of 2017.
“I will be spending more time on my solo work – performing concerts, acting and my own songwriting – as an artist I feel a lot more settled in this world,” he said at the time.
“When I started in Wet Wet Wet I gave it 100% of my heart and soul and that’s what it demands and that is also what the fans demand.
“And if I can’t do that because my focus is elsewhere, then this is not fair on the fans or the rest of the guys in the band.”
Tickets for Wet Wet Wet’s new shows are out on September 28.