Jennifer Lopez is throwing a little shade(s) of blue…

The 46-year-old Puerto Rican actress, singer and American Idol judge took to Facebook to premiere the first full trailer for Shades of Blue, the star’s crime drama premiering on January 7 on NBC.

Lopez plays Harlee Santos, an FBI agent and single mom assigned to an anti-corruption task force.

The series, created by Adi Hasak, costars Ray Liotta.

The trailer opens with Lopez’s Santos appearing to shoot her partner, though obviously appearances are deceiving. The trailer does establish what likely will be the central conflict of the series: Santos’ torn feelings about spying on her coworkers and her emotional allegiance to Liotta’s hard-driving boss character.

“There’s a rat!,” he yells. “A Rat! An FBI informant on my team!”

As for the show’s title, the tag line explains it: “Between good cop and bad cop…there are shades of blue.”

Click here to see the full trailer on Facebook.