At 41, Julia Roberts is reaping the benefits of becoming a full-fledged cougar after casting a spell on her screen hunk James Franco — who is ten years her junior!

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The pair play lovers in the upcoming film Eat, Pray, Love and set tattles claim their script chemistry is manifesting itself in real life.

“James has a massive crush on Julia, and she’s lapping up all the attention,” a spywitness reveals in the Sept.7 issue of Globe. “They’re always laughing and smiling when they’re together and sharing private jokes.”

The Pretty Woman star and Franco, an aspiring writer, have reportedly become inseparable between takes, with the Spider-Man actor adopting the role of eyes, ears, and hand when the cameras aren’t rolling.

“Julia doesn’t need a personal assistant because James is always running off to fetch her bottle of water or cup of coffee and asking if there’s anything she needs.”

Julia has a history of falling for her co-stars; the actress dated Dylan McDermott and Kiefer Sutherland after sharing the screen with the actors.

“James can’t stop bragging about how he gets to make out with Julia nearly every day,” the insider continues. “They even shot a steamy nude sex scene, which rocked his world! He keeps saying if only she was single…..”

Julia — a mother of three — has been married to hubby Danny Moder for seven years.