How do I tell this girl that I really like her?

So there's this girl I started talking to a lot. We've gone on a date but it was only like a friendly date so we're not like in a relationship or anything. We're part of the same church but I only see her every now and again at events and things. So we keep in touch over facebook and she and I talk all the time. I'm almost sure she likes me, she flirts a lot and talks to me until really late at night and posts on my wall and things. She was telling me I was attractive yesterday so I think those are obvious signs that she likes me. So I've liked her for a while now but I think she's trying to get me to like her too. I'm not quite as obvious with her that I like her. Its not really a question of if she likes me its more of how should I tell her I like her? What should I say without it being corny or awkward?