American judge says Tulisa will sell her acts short

They’ve been great friends up until now, but Kelly Rowland believes she is a much more ambitious X Factor judge than  Tulisa Contostavlos.

Kelly, 30, is mentoring the girls, and Tulisa, 23, has the groups.

I heard Tulisa say, “We’re looking for that next big UK star”,’ Kelly tells The Sun.

And I said, “Well. I’m looking for the next international star” because you can’t just put someone in a box – you give them everything they deserve.’

Kelly’s comment will undoubtedly rile the N-Dubz singer – and she knows things will get tense with Gary Barlow and Louis Walsh, too.

We have all got on pretty great so far, but that’s about to change,’ Kelly predicts.

Up until now we’ve been on the same side, but when it’s live finals, and we have our own acts to defend, you’d better know there are going to be fireworks!’

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Catherine Wylie