Miley Cyrus can ''smell bulls**t a mile away''.

The actress-and-singer - who starred in Disney's 'Hannah Montana' TV show aged 13 - has had people try and befriend her because of her fame and fortune, but can weed them out because she grew up around Hollywood with her famous father, Billy Ray Cyrus.

She said: ''We've always had money and fame. People who grew up without either can get more of a culture shock and go the wrong way. 'Oh my God, I have all this money. How can I spend it? All these people will like me because I'm famous.'

''I've always had people trying to be my friend for the wrong reasons. I'm used to it. I can smell bulls**t a mile away.''

Reflecting on her career, the 20-year-old star admits it's ''crazy'' her parents allowed her to pursue an acting career before she was even a teenager, landing roles in 'Doc' and the film 'Big Fish' before starring as Hannah in 2006.

She told Elle magazine: ''He [Billy] wasn't worried about me going crazy. My dad wasn't like that and my parents trust us and know us.

''I was just a baby. I had no teeth, no boobs. I was a little girl. It's crazy that a decision you make when you're a kid can affect your whole life - that someone would trust a child with her own future. It was just lucky that I managed I was able to love it and turn it around.''