How to dedicate a song to a girl?

So I've got a little gig night thing coming up and I asked this girl I like to come and watch and she said yeah. We're gonna play Vampire Heart by HIM and I wanna dedicate it to her but I don't wanna embarrass her by using her name, I also don't wanna make what I say sound cheesy so I'm sort of stuck trying to think of something to say.

Also ladies what would you think if someone dedicated this song to you?

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How to dedicate a song to a girl?
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