Mutya Buena, Keisha Buchanan and Siobhan Donaghy have revealed that there is no bad blood between them and the current Sugababes line-up.
There had been tension between the two groups after original bandmate Mutya won a legal fight to use the band's brand name on some products, but Keisha - who has now reunited with her bandmates as Mutya Keisha Siobhan - admitted the feud is now water under the bridge.
"It's all fine. We are moving on. We have moved on. And it's all positive," she told BBC Newsbeat.
The current Sugababes line-up consists of Heidi Range, Amelle Berrabah and Jade Ewen.
Keisha added: "Jade messaged me on Facebook the other day. I think for us we just want to concentrate on just being positive. We have been through things both as a band and as individuals."
Mutya Keisha Siobhan, or MKS for short, reformed in 2012 and their debut single as the new group, Flatline, will be out later this month. They founded the girl group together in 1998, and Heidi replaced Siobhan when she quit in 2001. Amelle took over from Mutya when she left in 2005, and Jade took Keisha's place when she decided to leave in 2009.
"We wanted to take our time and make sure it was right. The most important thing for us was to make sure we did it properly," said Mutya.
Siobhan admitted the group felt under pressure to emulate their previous success.
"It's difficult because there were always going to be expectations about what we do. The comeback single couldn't be obvious but it also couldn't be too out there and left field. But I think we've hit the nail on the head," she said.