But Cady doesn't just cross paths with this Queen Bee; she really stings her when she falls for Regina's ex-boyfriend Aaron (Jonathan Bennett). Now Regina's set to sting back by pretending to like Aaron so he won't go out with Cady, all the while pretending to be her friend. With no choice but to use the same M.O. to stay in the game, the "Girl World" one-upmanship escalates until the entire school gets dragged into a first-class mean-fest.