Country music superstars Miranda Lambert and Blake Shelton are ending their 4-year marriage. Reps for the couple told the Associated Press: "This is not the future we envisioned. And it is with heavy hearts that we move forward separately. We are real people, with real lives, with real families, friends and colleagues. Therefore, we kindly ask for privacy and compassion concerning this very personal matter." Shelton filed for divorce in Oklahoma, according to TMZ, a move which may come as a shock to fans of the superstar singers, who began dating in 2006. They were last seen together in public...