The band filmed the video for About A Girl in the US
The new Sugababes line-up have pulled out of what should have been their first live UK appearance because of "legal issues".
The female trio had been scheduled to appear as the headline act at the Scottish Royal Variety Performance at Glasgow's Royal Concert Hall.
A statement issued on behalf of the group said there are "a number of legal issues to be finalised".
Last month, the only original band member Keisha Buchanan left the group.
The 24-year-old insisted she was pushed out, but former bandmates Heidi Range and Amelle Berrabah have since denied the claims.
Buchanan was replaced by Jade Ewen - this year's UK entrant at Eurovision.
A statement on the Sugababes website said: "Following the recent and well documented change of line-up to Sugababes, there are a number of legal issues to be finalised by all parties in order that the band can move forward.
"Sadly, whilst these negotiations are approaching completion, it will not be possible for the band to finalise its business affairs prior to Thursday's event.
It added that the group wanted to "extend their most sincere and personal apologies for the inevitable inconvenience and disappointment that this decision will bring to the organisers and producers of the show".
The Scottish event was being held in honour of The Royal Blind Society.
However, as the group can no longer participate, they have announced they plan to put on their own show in the future, with profits going towards the chosen charity.
Ewen's parents who are visually impaired said: "This is such a disappointment to all of us."
Their manager Mark Hargreaves said: "This was indeed an unavoidable decision of a contractual nature but I am delighted to confirm that all other band engagements are due to resume next week when it will be business as usual for Sugababes."