Fresh from her split with Justin Timberlake, it looks like Jessica Biel might be on the rebound ... with her Playing The Field co-star (and onscreen love interest) Gerard Butler!

The two are currently filming in Shreveport, Louisiana, and a source tells Us Weekly that they first began cozying up to one another at a crew member's birthday party last week. "When Gerry got there, he made a beeline for Jessica. He was really flirting with her," the insider reveals.

Two nights later, the duo were seen downing margaritas at a local Mexican restaurant, and they've shared two more dinners together since then! A source close to the actress says she only wants to be "friends" with the hunky Scottish star, but given the amount of time she's going to be spending with him over the next few months, who knows what's going to happen!