CAPTION THIS! What Do YOU Think Justin Is Saying to Cameron on the Set of Their Movie 'Bad Teacher?'

If you were Jessica Biel, wouldn’t you be mildly concerned that Justin and Cameron seem to be having a rather good time on set?

So, BFFs, before you all blast us for making trouble, here’s the situation, in case you’d forgotten: Justin Timberlake and Cameron Diaz dated for four years and broke up in 2007. Now, Justin, 28, is with Jessica Biel. Cameron, 37, is very single — and looking very hot on set, in tiny jean shorts and tight black pants like the ones in this photo taken today, April 7.

Meanwhile, and we point this out strictly for its news value, Deadline.com reports today that Justin is making a deal to star in a new romantic comedy called Friends with Benefits (one of three projects which have the same title, actually.) Let’s repeat that one more time: Friends with Benefits.

Now, Hollyfaithful: Caption away!