Better late than never?

On Oct. 2, Arnold Schwarzenegger shared a heartfelt and, quite honestly, unexpected post on Instagram wishing his one-time secret son, Joseph Baena, a happy 19th birthday.

"Happy birthday, Joseph. Great student, great athlete. I'm proud of you and I love you!" Arnold captioned a pic of them together -- both in traditional lederhosen -- while enjoying Oktoberfest celebrations in Germany.

Happy birthday, Joseph. Great student, great athlete. I'm proud of you and I love you!

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It's a rare and progressive moment for Arnold, who, after initially keeping tight-lipped about his youngest son, has been spotted spending more and more time with the Pepperdine University student (including at the gym!) over the last few years.

In May 2011, Arnold and journalist Maria Shriver split after 25 years of marriage. Days later, more bombshell news emerged: The movie star and former Governor of California had fathered a son more than 14 years earlier with his and Maria's longtime housekeeper, Mildred Baena.

Joseph, Mildred would later reveal, had privately been told about his true paternity only a year earlier.

Arnold's sweet post for Joseph comes just four days after the Austria-born star shared some birthday love for Christopher, his youngest son with Maria -- from whom he is, strangely, still not divorced.

Christopher is the same age as Joseph -- yes, Arnold's wife and housekeeper were pregnant with his children at the same time.

"Happy birthday Christopher! I love you and I'm so proud of you. I know this year will be your best yet," Arnold captioned the throwback shot of himself cuddling with a young Christopher.

Happy birthday Christopher! I love you and I'm so proud of you. I know this year will be your best yet.

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A week earlier, Arnold and Maria's other son, Patrick Schwarzenegger, posted a photo of himself, Maria, 60, Arnold, 69, and sisters Katherine, 26, and Christina, 25, all together at Nobu Malibu celebrating his birthday.

"🎂🎂🎂23🎂🎂🎂," Patrick captioned the snapshot.

🎂🎂🎂23🎂🎂🎂

A post shared by Patrick Schwarzenegger (@patrickschwarzenegger) on

In 2015, Arnold told Howard Stern that he was trying to make the best of a painful and awkward experience and praised Joseph as well as his kids with Maria for enduring the scandal.

"He's terrific and he totally understands the situation," Arnold told the shock jock of Joseph. "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?"