Jessica Biel, watch your back. It seems that the sparks are still there between your man, Justin Timberlake, and his former flame of four years, Cameron Diaz. Though news they’re co-starring as love interests in the upcoming rom-com “Bad Teacher” might have set off an Awkward Alert, the pair have been “laughing and flirting” on set, an insider told the New York Post.

J.T. and Cammie, who even share a comic love scene in the flick, are said to be “acting like a couple of teenagers, constantly laughing and joking with each other.”