The couple met while making Spring Breakers, an indie flick costarring Selena Gomez and Vanessa Hudgens.
Franco, 34, and Benson, 22, were recently spotted holding hands at L.A.’s Haunted Hayride, according to the New York Post, which first reported the new romance.
Reps for both did not immediately comment.
The two are seen in some very comprising positions in Spring Breakers, a drug and sex-fueled film about four coeds who find themselves mixed up with a drug dealer.
One scene in particular features a three-way romp with Hudgens in a swimming pool.
Benson told us at the Toronto International Film Festival in September that Hudgens and Franco made it as comfortable as they could for her.