Cyrus, 20, admits she hangs out with Bieber, 19, a "little bit" and has been attempting to help him get his life back on track following a series of headline-grabbing stunts, including an Internet video which showed him urinating into a restaurant mop bucket, nightclub fights and brushes with the police.

She tells Rolling Stone magazine, "(I hang out with him) a little bit. But not really. I'm not much older than him, so I never want it to feel like I'm mentoring him. But I do mentor him in a way... I just don't want to see him fuck that (his career) up, to where people think he's Vanilla Ice. I tell him that. Like, 'You don't want to become a joke. When you go out, don't start shit. Don't come in shirtless.' But the thing is. I think boys are, like, seven years behind. So in his head, he's really, like, 12."