The Big Reunion hasn't even begun yet but there's already tension between the cast.
The show starts on February 6 on ITV2 and two of the bands - A1 and 5th Story - are said to no longer be on speaking terms.
It follows claims that a member of 5th story branded trio A1 "cheesy".
An insider tells heat magazine: "It seems they're doing their utmost to avoid each other, which isn't easy, as they're all using the same rehearsal space.
"Things are far from peaceful and it might only get worse in the run up to the live concert."
5th Story are a new group formed from past stars included Adam Rickitt, Dane Bowers, Gareth Gates, Kavana and Kenzie.
On whether the band will work, Kavana admits: “Is there going to be a lead singer? Is there going to be a lot of egos in the room? Is it going to be a case of ‘well, I sold more records than you… you only get to number 8, well I got to number 1.’ How’s that going to work? Can we all sing together? Can we all sing?”
Browse pictures of the Big Reunion 2014 line up below...