GIRLS!!!! I'm in love with this girl, what should I do?

Girls, I've been pretty close friends with a girl in my cl for two years now. We're both seniors and I've liked her in the past and she knew about it and I don't think so but she didn't like me then. We've been hanging out more lately and I'm really starting to fall for her again. What would you say I should do to get her attention. She is very beautiful, extremely intelligent, and we have everything in common. We have fun together, and I'm a rather conserved person and so is she although sometimes she can get a bit wild. I think that's part of why I like her so much. I just don't really know what to do, because I want to get her attention and be irresistible. Please help.... thanks in advance!!