The Kardashian-Jenners’ long-term private chef says the family loves feasting on “cheat meals”. Khristianne Uy, more commonly known as Chef K, added they love pasta and grilled cheese, but says they balance it out by sticking to a “rigid” exercise regime. The cook told Page Six about the eating habits of Kris Jenner and her five daughters – Kourtney Kardashian, Kim Kardashian, Khloé Kardashian, Kendall Jenner and Kylie Jenner: “Let’s just say they have one whole grilled cheese; they’ll make up for it by working out at the gym. “They’re really rigid about that.” The chef stressed the reality st…