GIRLS ONLY!!!!I think this Drop dead beautiful girl likes me. How should i ask her out?

I think that she is the most beautiful girl i have ever met, and i think she likes me. I am not the most handsome guy in the world, so it makes me wonder how such a wonderful girl can like a guy like me. i am not sure, but i think that she does like me. When she sees me she always smiles and says hi. I say hi back and maybe talk a little bit before going to cl. I say hi to her, tell her she looked nice at the game last night when she was a cheerleader, give her gum... etc. she always tells me that i am like the nicest guy she has ever met, and that makes me feel good. When i see her staring in cl, i stare back and she doesn't look away, just looks back at me with her beautiful green eyes. She then smiles. my feelings for her are like the song Just the Way You Are by Bruno Mars, does she like me? And if she does, how do i ask her out?