Arnold Schwarzenegger celebrates son Joseph Baena's birthday with moving tribute

Like father, like son. Arnold Schwarzenegger took to his Instagram account on Monday, October 2, to celebrate his son Joseph Baena’s 20th birthday. The Terminator star shared a picture of himself and his son working out together at a gym, which he captioned: "Happy birthday Joseph! You're a fantastic son and a great training partner. You get stronger and smarter every year and I'm so proud of you. I love you."

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arnold-joseph-baenaVIEW GALLERY Arnold celebrated his son's 20th birthday with a work out photo Photo: Instagram/schwarzenegger

The sweet note comes a few days after Arnold's other son Christopher Schwarzenegger celebrated his 20th birthday on September 27. Attached to a throwback snap, the 70-year-old actor wrote: "Happy birthday Christopher! You're a wonderful student, a hilarious and kind soul, and a fantastic son. I'm so proud of you, I love you, and I can't wait to see what's next."

For Joseph’s birthday last year, Arnold and his son enjoyed a trip to Oktoberfest in Germany, where the pair treated themselves to a selection of beers at the famous festival. Not much is known about Arnold's relationship with his son Joseph, whose mother is the Hollywood actor's former housekeeper Mildred Baena.

joseph-baena-dad-arnoldVIEW GALLERY The actor fathered Joseph with his family's former housekeeper Mildred Baena Photo: Instagram/schwarzenegger

Mildred worked at the Schwarzenegger household for 20 years but left her job when she found out she was expecting Arnold's baby. She gave birth to Joseph in October 1997. One month later, Arnold's then-wife Maria Shriver gave birth to the couple's fourth child, Christopher. Arnold is also a proud father to daughters Katherine, 27, Christina, 26, and son Patrick, 24, from his marriage to Maria Shriver. 

In 2015, Arnold opened up about his "fantastic" son Joseph. "He's terrific and he totally understands the situation," the actor told SiriusXM host Howard Stern. "So, it all has worked out… It's a very tough situation for him. It's a very tough situation for my kids, very tough situation for my family. It was tough for everybody. But it has happened and now we have to figure it out, right?"

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