The former N-Dubz stars are feuding over Dappy's latest song, which bashes Simon Cowell and the X Factor.
X Factor judge Tulisa Contostavlos started a Twitter row over her former bandmate and cousin's song lyrics.
Lyrics to the song include: "I heard Simon Cowell thinks I'm a little w***er/ And that I'm getting on his t**s like cancer/ I don't want to start mentioning names (f**k it)/ Where they all now? They're bankrupt.
"Joe McElderry, oh what a stand up/ Alexandra [Burke], pull your socks up/ Where your hits at, you ain't no winner/ I feel bad cos your voice is amazing/ But your career is getting raped by a mason."
Tulisa hit back at Dappy, tweeting: "Just puttin it out there. dont involve me in dappy's latest hype, I don't condone it in anyway. N its a shame I'm not around 2 control him (sic).
"I told u hes a nut, I dealt wid this 4 13 years. I just hope people realise hes simply lost his mind since B's death. that's all, 4 his sake. (sic)"
The "B" Tulisa refers to is Dappy's father, Byron, who was instrumental in the band's rise to fame but died in 2007.
The video for Dappy's freestyle includes a person in a Simon Cowell mask wrestling a person in an Alexandra Burke mask.
Dappy replied by writing: "T... Why would u say this about my work. Just so u can keep cool with your xf job.
"Sad really ... Guess im on my own again ... F**k x factor (sic)"
Tulisa - who was criticised by Dappy when she first accepted a job on Simon's pop star search show - then made a plea for Dappy to change his ways, writing: "Ur a talented little f**ker with to many issues! sort it out daps friggin sort it out!!! (sic)"
