Plastic surgery fan Jessica Simpson can’t stop tweaking her body — and now insiders claim the pop star plans to boost her butt to complete her transformation into a curvy Kardashian clone, RadarOnline.com has learned. A sensational report alleged Simpson, 43, plans to go under the knife yet again, this time to maximize her backside. Selfie-snapping Simpson recently shared a photo of herself wearing a clingy orange dress on social media — and one follower accused her of being “Kardashianized!” An insider claimed the self-conscious singer is “obsessed” with surgical fixes — and everyone is “blam…