NATALIE Cole is worried she may not find a kidney donor in time. Nat King Cole’s superstar daughter, who’s currently on dialysis, told Los Angeles Confidential magazine: “In my younger, hell-raising days, I was an active drug user, and heroin was my drug of choice. In the process [I] contracted the hep C virus.” The singer is now praying an organ transplant will come through soon, “but, at the moment, where it’s coming from, heaven only knows,” she said.