Girls, is she giving me signs she likes me? Should I talk to her?

Ok, here's the deal. There's this really REALLY pretty girl I see in the hallways throughout the day, and I really want to get to know her. Thing is, we don't have any cles together, I only see her in the hallway. I'm pretty sure she likes me back though. One time her and her friend kept turning around and looking at me as they were walking down the hall. Another time, she kept turning to her side and looking at me on her way to her cl, then when she got there, she turned around, looked at me again, then walked in. The following monday (that happened on a friday), she smiled. The thing though, is that I wasn't expecting to see her (I was late to first period), and I was really nervous, so I didn't smile back, I just kept looking at her. I was worried I sent the wrong message, and all day, I kept stressing out and thinking "dammit I hope I didn't send the wrong message, I really like her". The week after that, I started seeing her in the morning more often when I was at my locker. One time when I was at my locker, her and her friend walked by, and when she walked by, she walked REALLY close to me. Another time, I was waiting for my friend at his locker, and I saw her and her friend walk by. After she ped by me, she turned around and looked at me. Like a week ago, I saw her looking around (the same place she was looking at me on her way to her cl), and I think she was looking for me. The yesterday, I saw her there again, and this time, she turned around and looked at me again. Then, I saw her when I was walking down to my last cl, and I saw her eyes roll towards me as she was talking to her friend. Today, I would've tried talking to her, but when I normally see her (after fourth period), all the people in front of me were walking really freaking slow so I couldn't. I saw her after my 5th period, but she didn't see me. I really want to get to know her, she's the only girl that I've ever been this sure likes me, I've had a crush on her since like November, she's so unbelievably pretty. Girls, is she giving me signs that she likes me? Should I talk to her? (sadly, it's spring break, so I'm gonna have to wait a few days before doing so, I was hoping on getting her number beforehand so I could hang out with her over break =\)