Marie Osmond has hit out at Miley Ray Cyrus' parents, blaming them for allowing her to pose for controversial Vanity Fair pictures. Osmond claims the 15-year-old's dad Billy Ray Cyrus should never have left the teen star alone with famed photographer Annie Leibowitz. The former child star tells AOL television, "My parents never, never left us alone. We always had some form of a guardian or something with us, a guardian that would represent what they would have done. But, in (Miley's) case, her dad stepped out, and that's when it happened. How do you say no to somebody like Annie Leibovitz when you're a little girl?" Osmond has her own parenting problems - last November her 16-year-old son Michael checked into rehab suffering undisclosed "problems."