Binding recently gave birth to her first child with partner Matthew Ridge.
The band has written a new song in a bid to raise money for the Child Cancer Foundation's One Day promotion, and performed it for the first time at the Northern Mystiks vs NSW Swifts game in Auckland yesterday.
"We've been talking about getting back together for years," Alatini told Breakfast.
"We got together and had a spontaneous dinner one evening, after a few wines we were in the taxi belting out a few songs and we thought, 'Hey, we could do this'."
Reaction on Twitter was mixed, with Euan Ross saying: "TrueBliss are reforming?!? If this isn't a clear sign of an impending apocalypse, I don't know what is!!"
But Colleen McGeady was more positive: "nz's spice girls reform! Omg! Jo cotton looking fab!"
And Jodes said simply, "Yahoo".
TrueBliss disbanded in 2000 after a brief but sucessful run of singles, including Number One, Freedom and Tonight.
They were brought together by the makers of the reality TV show Popstars, which pre-dated popular talent shows like American Idol and The X-Factor.
The reunion comes hot on the heels of the Spice Girls, who briefly reunited to launch a musical in London late last week.
Visit www.childcancer.org.nz for more information.
- Herald online