mila kunis and ashton kutcher respond to impending lawsuit in video .
kutcher claims kristina karo was one month old when the alleged incident occurred .
kunis says she will counter-sue because of injuries sustained while watching karo 's music video .
karo claimed to be kunis 's ` childhood friend from ukraine ' and is suing her for $ 5,000 .
claims kunis ` stole her pet chicken ' when they were children .
karo , now in la , claims she has been traumatised by the event and is suing actress for emotional distress and therapy bills .