Will Cameron Diaz Come Between Justin Timberlake and Jessica Biel?

New reports hint that Justin Timberlake is getting cozy on set with his ex

We recently asked if you'd let your man get intimate with Angelina Jolie in a movie scene, and now we're wondering: How about if he snuggled up to Cameron Diaz? And what if they'd dated before? (Kudos to your guy, by the way, if he pulled that off!) Jessica Biel faces that dilemma as her boyfriend Justin Timberlake films Bad Teacher opposite his sexy ex.

In a new cover story, Us Weekly reports that Timberlake, 29, has been palling around on set with Diaz, 37 (the two dated for four years) and a source describes "lots of laughing, making fun of each other, kidding around off camera." 

Allegedly, the two exes are acting like it's "old times" and Diaz is reportedly being overtly flirtatious with her spoken-for costar. "She's sassy with him -- and slick, prancing around in tight clothes," says the source.

The report will be of no comfort to Biel, 28, who was apparently "tortured" by Timberlake's decision to star in the comedy about school teachers getting entangled romantically.  "They are reaching a breaking point," a friend of the couple told Us. "The truth is, I don't know if they can survive this." 

With rumors swirling that the pair have had heated quarrels over the phone, it won't make matters any easier for Biel if it's true that Timberlake is prone to "make fun of her to his friends" when she's not around. We don't like the sound of that one, either! If his girlfriend truly meant something to him, we'd hope this acclaimed singer with movie-star aspirations would not make a sensitive situation worse by cozying up to such a pretty, single former flame!

Plus: Justin Timberlake and Cameron Diaz Back Together...for a Movie

Do you think Justin Timberlake and Cameron Diaz will get back together? Chime in below!

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