As those many ABC promos have hinted, Whitney Houston spills her guts to Diane Sawyer on tonight's Primetime (airing at 9 pm/ET). Here's a preview: When Sawyer asks whether it's been alcohol, marijuana, cocaine, pills or "all" of 'em that trouble her, Houston responds: "It has been at times." The singer goes on to suggest she's been "addicted to a few things" — including "making love." Yikes! Houston also denies talk of anorexia and bulimia, and says prayer has been helping her. Hubby Bobby Brown also appears to say, "Me and drugs... we're not friends." Now there's a surprise.