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"Happy birthday to my smart, independent, beautiful, strong, talented daughter. I love you, @katherineschwarzenegger," the 68-year-old captioned his adorable throwback snap.
Arnold and Maria divorced back in 2011 after 25 years of marriage, after the former California Governor admitted that he had an affair and secretly fathered a child with the family's housekeeper. The pair have put up a united front for their kids in recent years though, with Schwarzenegger crediting his children and ex-wife with keeping the family together.
"The only way it happens is if all of you work together," he said in a recent interview with Howard Stern. "So my wife was helpful, the kids were helpful, people around us were helpful, and so I tried to be as helpful as I can with the whole thing. I was one of the fortunate ones that we have really great, great kids."
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