Miley Cyrus fell for Liam Hemsworth when he opened the door for her.

The 17-year-old singer-and-actress admits she was instantly smitten with her 'Last Song' co-star when he displayed his impeccable manners on the set of the movie.

She said: "He opened the door for me. I was like, 'I have been in Los Angeles for three years and I don't think any guy has actually opened the door for me.'

"I was like, 'Wow, that is super impressive'. I actually turned to the director and said, 'He's got the job, he's hot and he opened the door. Excellent.' "

Despite being delighted at finding romance on the set of the movie, Miley admits she and Liam, 19, initially struggled with their feelings for one another.

She explained to US TV talk show host Ellen Degeneres: "We started filming and at one point the chemistry was kind of awkward.

"I liked him a little bit, he liked me a little bit but it was awkward."

However, once Miley felt more comfortable, she soon took charge in their relationship.

She told Liam: "OK, you're going to be my boyfriend."

Earlier this week, the 'Hannah Montana' star admitted she was too shy initially to discover if the Australian hunk liked her, so she paid her 'Last Song' co-star Bobby Coleman $10 to find out.

She admitted: "I paid him 10 bucks to go ask Liam if he liked me. I sent him back and forth. It was really funny."