I would never say Emma Roberts is a great actress but I think she plays a great evil bitch. I 100% bought her as a fame seeking sociopath who would kill her friends (and her iconic loopy mom #justice4kate) just to have what Sidney had. I thought she delivered. Also the entire motive if anything was a few years ahead of its time and still totally holds up. When she says "I told so many lies today that I started to believe them. I think I was born for this." and when she does that little smirk after Sid says "You'll fall, they always do." The acting chops!