KEEP YOUR FRIENDS CLOSE…. Have you ever had a friend turn on you? Just totally transform from someone you thought you knew into someone…else? I’m not talking your boyfriend from nursery school who grows up and gets gawky and ugly and zitty, or your friend from camp whom you’ve got nothing to say to when she comes to visit you over Christmas break, or even a girl in your clique who suddenly breaks away and turns goth or into one of those granola Outward Bound kids. No. I’m talking about your soul mate. The girl you know everything about. Who knows everything about you. One day she turns around and is a completely different person. Well, it happens. It happened in Rosewood. “Watch it, Aria. Your face is going to freeze like that.” Spencer Hastings unwrapped an orange Popsicle and slid it into her mouth. She was referring to the squinty-eyed drunk-pirate face her best friend, Aria Montgomery, was making as she tried to get her Sony Handycam to focus. “You sound like my mom, Spence.” Emily Fields laughed, adjusting her T-shirt, which had a picture of a baby chicken in goggles on it and said, INSTANT SWIM CHICK! JUST ADD WATER! Her friends had forbidden Emily from wearing her goofy swimming T-shirts— “Instant Swim Dork! Just add loser!” Alison DiLaurentis had joked when Emily walked in. “Your mom says