N-Dubz could split over Tulisa Contostavlos' new job as X Factor judge, it has been reported.
The singer, who joins Gary Barlow, Kelly Rowland and Louis Walsh on the new series of the X Factor, has upset cousin and bandmate Dappy.
A source told The Sun: ''Dappy is livid about the whole situation. Tulisa has a new passion now and that's not what they got into the business for. He has thrown himself into his solo career because, as far as he is concerned, N-Dubz is all but over."
"The last album didn’t do as well as he hoped and X Factor caused a lot of problems between them."
A spokesman for the band said: "The band will continue despite solo projects. They have gigs throughout 2011 and plans are in place for another single and album. The band are definitely not splitting up."
Contostavlos was revealed as Cole's UK replacement last month, but when the Girls Aloud star was sacked from the US version it was rumoured she may return to the original format.