Sugababes have claimed that they would split if another member ever left the band.
The girl group are currently on their fourth lineup and have no original singers left following the ousting of Keisha Buchanan last September.
In an interview with Company magazine, the trio's longest-serving star Heidi Range confirmed that another shake-up for Sugababes is out of the question.
She commented: "We've said if something happened again we wouldn't carry on the band with someone else. This is it."
Sugababes are currently promoting new album Sweet 7, which is released on Monday and is the first to feature latest member Jade Ewen.
In January, Amelle Berrabah declared that the band currently has a "perfect" lineup, promising: "Nobody will be leaving and we won't be getting anyone new."
