Miley Cyrus paid to find out if boyfriend Liam Hemsworth liked her

Miley Cyrus paid $10 to find out if boyfriend Liam Hemsworth liked her - because she was too shy to ask.

'The Last Song' star said she bribed her on-screen brother in the film, Bobby Coleman, to find out what her Australian co-star thought of her.

Of Bobby she said: "He is probably one of the most hysterical kids I've met in my life. This kid will do anything for five bucks. By the end he literally had a receipt for me. It was like $80. I paid him 10 bucks to go ask Liam if he liked me. I sent him back and forth. It was really funny."

Miley, 17, also told how dating her co-star led her to made extra effort on-set, which she also said was positive because she is trying to promote a more mature image as she makes the transition from child star to serious actress.

Miley - who shot to fame as star of 'Hannah Montana' aged 13 in 2006 - added: "It was really good working with Liam, because it makes you want to come to work and look good.

"I'm trying to make people see my work as a real actress and more mature. And when you have someone who loves you and wants you to do well, you really want to help each other, and you want to make each other look good. We both were trying to get our point across that we can do more than what people know us as."