It's safe to say that the battle lines have been firmly drawn between the old Sugababes (or MKS as they're now calling themselves) and the current line-up.
Heidi at Chelmsford's V Festival over the weekend
The girls had managed to keep apart as they partied on different sides of the Virgin Media Louder Lounge at the event in Chelmsord, Essex.
However, when Mutya and Keisha spotted Heidi, who was with Emma Bunton and Leigh Francis, they walked off without so much as exchanging a hello.
MKS are set to launch their first single later this year
"It was a really obvious snub," said an eyewitness. "There's clearly no love lost between them and Heidi."
> IN PICS: CELEBS AT V FESTIVAL 2012