Miley Cyrus sometimes is dubbed an inappropriate role model for teens, but the 17-year-old pop star may be more responsible than her critics would have you believe. While the "Can't Be Tamed" songbird has been spotted out and about several nights in a row this past week, HollywoodLife reports that Miley isn't doing any partying–in fact the young star acts as a designated driver for her pals. On a recent outing to Mr. Chow, the 17-year-old superstar reportedly acted as the designated driver for her pals. "Miley wasn't drinking," an eyewitness tells HollywoodLife, "Which was good because she w...