If you’ve been duped by AI, you’re not alone. “The Real Housewives of Beverly Hills” star Kathy Hilton revealed she tried the Jell-O diet — which she thought was endorsed by Oprah Winfrey, Michelle Obama, Kelly Clarkson and Dr. Mehmet Oz — and it left her bloated and regretful. Turns out, Winfrey and the other celebrities Hilton named aren’t actually supporters of this diet, but versions of them, rendered by artificial intelligence and created t…