Tulisa Contostavlos: 'N-Dubz rift rumours are nuts'

Tulisa Contostavlos has denied that she has caused a rift in N-Dubz over her solo career.

The singer and X Factor judge was said to have fallen out with her bandmates Dappy and Fazer over plans to perform on the series without them.

Contostavlos tweeted: "Really have no idea where these stories r coming from, no truth in them at all, I have not had any arguments with dappy n faze about r career. (sic)

"Or anythin 4 that matter, & I will not b releasing any material until after xfactor."

Responding to reports that N-Dubz were recently dropped from their US label, she continued: "We chose 2 leave r american deal, these rumours r nuts x."

X Factor judge Louis Walsh recently confessed that he didn't know who Contostavlos was before she joined the show.

Watch an exclusive clip of N-Dubz performing a mash-up of Jay Sean's 'Down' and Black Eyed Peas' 'Meet Me Halfway' below: