’s son Joseph Baena is getting serious about acting – and RadarOnline.com has learned exclusively he’s determined to be the biggest action hero of his generation.

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“Joseph looks and acts more like Arnold than even his kids with Maria (Shriver),” a source told RadarOnline.com. “He’s really embraced bodybuilding as a way to prove himself to his father and now, the film industry.”

As RadarOnline.com readers know, Baena is the buff illegitimate son of the former Governator and his former housekeeper Mildred Baena.

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The 21-year-old is the spitting image of his famous father during his youthful Conan the Barbarian days.

“He’s already won the attention of some powerful behind-the-scenes players — managers and agents — who see the potential there,” the insider added.

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Joseph is said to be obsessed with developing his physique, acting chops and charisma so that he can be a viable leading man, with or without his father’s help.

And when it comes to making it big, the young Schwarzenegger heir is aiming right for the top.

“Joseph is eyeing a career very similar to his father’s in that he plans to skip the step of doing supporting roles and hit the ground running by seeking leading roles — preferably in action and thriller films — like his father did 40 years ago,” the source said. “And to do that, he’s going to need a lot more than just his famous genes.”