Joseph Baena just graduated from college … and his old man is beaming with pride.
Arnold Schwarzenegger shared the news Saturday along with a happy photo of the 2, saying … “Congratulations Joseph! Four years of hard work studying business at Pepperdine and today is your big day!”
He added … “You have earned all of the celebration and I’m so proud of you. I love you!”
Arnold and Joseph have been tight the past several years — even working out together — but as far we know, Arnold’s kids with Maria Shriver — Katherine, Christopher, Christina and Patrick — have never had a relationship with him.
Doesn’t look like any of them were at the graduation either … but that’s not going to spoil the moment for father and son.