WOULD YOU SHUT UP ALREADY????

So, I just have to vent about one of my classes and three other students in the class. They won't shut up. They sit behind where I sit (about three rows back) and they just talk the whole time. There's two guys and a girl. The girl sits in the middle. She's one of those giggly "hair-make up & nails" types. She's talks to one of the guys while the professor is explaining something then when the professor moves on to the next item she'll have the other guy explain it all to her. We're only about 5 classes into the semester. This has already been going on the whole time. Today, the professor actually put her on the spot and asked her questions to show that she wasn't paying attention. She just guessed a couple times and got the right answer. As soon as the professor was attending to a question that came from the other side of the room, she was right back to talking to one of the guys. I turned around and looked and he said, "I'm explaining it to her." I was giving them, "shut up" looks the whole class and with about a minute left of class, she says, "OMG!" and rolls her eyes at me. I said, "that's funny, because that's how I feel." She rolled her eyes at me and I said, "all I hear is you three talking behind me. You want to flirt with them, go in the hall and do it but, I come to class to learn." I wish the professor would do something but, he probably won't. WTF?