This week, tween star Miley Cyrus shocked America when she crossed over to the dark side of adulthood. When Vanity Fair released photos of 15-year-old Miley draped in a sheet, concerned parents and Disney execs were aghast that their sugary pop idol had become a sexualized young woman. Parents told reporters that they were no longer going to let their daughters watch Hannah Montana, Miley’s Disney-produced television show-turned-musical-act-turned-brand-phenomenon. Internet message boards, populated mostly by furious mothers, advocated for a massive Hannah Montana paraphernalia bonfire. There are rumblings that Disney might even replace Miley with her up-and-coming co-star, Serena Gomez. Miley...