In the trailer for NBC's Shades of Blue, Jennifer Lopez is not exactly what you'd call a perfect cop. In fact, she's pretty damn shady. Her crime-scene fixing, bribe-taking ways, however, lead to a world of trouble. Especially when it comes to her character's relationship with Dec. Harlee Santos (played by Ray Liotta). The 13-episode series is Lopez's first starring role on a television show since the 90s, when she appeared in a short-lived CBS crime procedural called Hotel Malibu. Shades of Blue premieres Jan. 14 on NBC.