All Saints are set to reunite for five shows, as they support Backstreet Boys on their UK tour.
Melanie Blatt, Shaznay Lewis, and sisters Natalie and Nicole Appleton will get back together as they join the US boy band for their UK shows in 2014.
"We are really looking forward to performing together as special guests of the Backstreet Boys," the group said in a statement.
"The Backstreet Boys are a great band, so it's an honour. We're singing a lot of big songs like Never Ever and Pure Shores which will be amazing. We can't wait!!"
The girl group, who enjoyed success in the late 1990s, have split up twice in the past, most recently in 2008 after they planned to record new material.
Melanie said in 2009 that a reunion would be unlikely. She told London Lite: "All Saints are never getting back together again. I never want to sing again."
She later appeared to backtrack on her comments, saying: "I can't see it, but then I never thought I'd see Michael Madsen in Celebrity Big Brother either. Who knows what will happen?"
The UK dates start at Birmingham's LG Arena on March 26, before heading to Dublin, Glasgow, London and Manchester. Tickets will be available from 9am on November 22 through www.aeglive.co.uk.