This could get ugly!
She's demanding that the current 3 remaining members of the band, Heidi Range, Amelle Berrabah and Jade Ewen, call themselves something else or pay Keisha a large lump sum up which could be millions of pounds!
An insider reveals:
"This is a landmark case and will send shockwaves through the industry. The Sugababes are one of the most successful girl bands of all time, but if they are forced to change their name it would be absolutely disastrous for them."
Keisha left the band back in September citing "a breakdown in communication and lack of trust," but supposedly she was forced out by Heidi for constantly bullying Amelle.
The current Sugababes have consistently said in interviews that they are much happier without Keisha in the band — but they could be paying for it later!
[Image via WENN.]