Arnold Schwarzenegger's 18-Year-Old Son Joseph Baena Looks So Much Like Him -- See the Pic!

It's like 'Twins' with Danny DeVito but actually though.

Sorry Danny DeVito, looks like Arnold Schwarzenegger has a for real twin now.

The former Governor of California's son, 18-year-old Joseph Baena was spotted out in Malibu, California, on Thursday, flashing a smile while looking super strong and baring more of a resemblance to his father than ever.

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Joeseph is looking so grown up!

Schwarzenegger fathered his son with his former housekeeper, Mildred Baena. The action star has four additional children with estranged wife, Maria Shriver -- 26-year-old Katherine, 24-year-old Christina, 22-year-old Patrick, and 18-year-old Christopher.

WATCH: Arnold Schwarzenegger Calls Couples Therapy With Maria Shriver the 'Biggest Mistake' He's Ever Made

Watch the video below for more celeb kids who resemble their famous parents.