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I guess it really depends on the girl, how I initially thought of her, or how she tells me.
Personally this has never happened to me before. However, if I was made aware that a girl likes me I would be happy and flattered (I'm self-conscious when it comes to girls, so having one into me would be awesome in my opinion). So to answer your question, I think it would be more of a turn on for me. But again, I will have to see until it actually happens (if ever).