Arnold Schwarzenegger’s son Joseph, born in a scandal, is all grown up and is a chip off the old block! New photos show that Joseph Baena–the son Schwarzenegger secretly had with his housekeeper, Mildred Baena, while he was married to Maria Shriver—is a workout enthusiast just like his dad. Click on RadarOnline.com’s gallery for more on 19-year-old Joseph’s buff body!

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The world was shocked to learn that Schwarzenegger, now 69, had cheated on his wife Shriver with the family’s maid.

Just one week after announcing he was separating from Kennedy scion Shriver in 2011, Schwarzenegger dropped the bombshell that he’d fathered a child with his former housekeeper Mildred.

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And now, Schwarzenegger’s once-secret son Joseph is 19 and all pumped up, just like his famous father. He was photographed on Malibu Beach in California on Friday jogging with friends.

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Joseph looked like he’s been lifting plenty of weights as he showed off abs of steel. The Terminator star’s son wore pair of blue trunks for his Friday exercise routine.

Schwarzenegger had secret visits with Joseph as he grew up but now.

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Schwarzenegger first shot to fame as a bodybuilder before becoming a mega movie star and then the governor of California.

His marriage to Shriver lasted 25 years but then Schwarzenegger had to admit he had cheated on her with the family’s longtime maid.

Even more humiliating for Shriver, he’d fathered a son with Mildred right under his wife’s nose.

SOURCE: BACKGRID

Joseph has grown up quietly, largely out of the spotlight, but photographers caught him out displaying his rippling biceps.

Joseph was born just one week after Schwarzenegger’s youngest son with Shriver, Christopher, painful timing for his wife. The movie he-man and Shriver finalized their divorce quickly in 2011.

SOURCE: BACKGRID

Although Joseph reportedly wasn’t with Schwarzenneger and his four kids from Shriver on Father’s Day, the actor recently Instagrammed a message to his boy to celebrate his 19th birthday, writing, “Happy birthday, Joseph. Great student, great athlete. I’m proud of you and I love you!”

Joseph has been seen riding bikes with his dad. His birth was kept a secret from the public for 14 years. Shriver allegedly confronted Schwarzenegger about Joseph’s uncanny appearance to Arnold in 2011, ending their long marriage.

The star’s love child grew up in the low-key community of Bakersfield, Calif., but has lately been seen near his dad’s Malibu stomping grounds.

Joseph isn’t shy about his body! Last year, as RadarOnline.com reported, Joseph was also seen shirtless on the beach in Malibu. Schwarzenegger claimed to 60 Minutes that he didn’t know Joseph was his son until he was about 7 or 8 and the resemblance became obvious.