I Am In Love

So, I've posted about this a little while ago, and I think I've kind of got stuff handled, but I need some advice here. Me and my friend have become closer recently, and I can tell by her mannerisms that she at least likes me platonically (I would like to think that I come off the same to her) and now that I'm working towards my learner's permit, I'm hoping that we can start meeting more freely soon. But let's not get ahead of ourselves. What I want to ask you here is, how do I tell her that she is beautiful without revealing my love or sounding creepy. She's absolutely gorgeous, and I want to tell her, but however I word it, it always comes out wrong.
Little help, plz.