According to
THIS article in today's Sun Online, Kate launched a verbal attack on Jade at a party for family and friends last night.
IF it's true, and that's open to debate, then I'm sure Kate was just joking about. She's already said a couple of other things about wanting to fight Jade, which were clearly meant as a joke, but which the tabloids twisted around and reported as being meant seriously.
Still, even if meant as a joke .......... they were pretty harsh words!