Christina Aguilera may be leaving The Voice, but it sounds like it may not have been the easiest decision to make. "It's bittersweet," the Grammy winner exclusively told us earlier today while promoting her new just-released-on-iTunes single, "Your Body," from her upcoming album Lotus (out Nov. 13). "I so enjoy being a coach to my team on The Voice [and] and at this point in season three, all of ...