Arnold Schwarzenegger celebrates son Joseph's birthday with Oktoberfest booze up

Arnold Schwarzenegger has always been a big fan of Oktoberfest.

And this year, it’s an extra special visit – to celebrate the 19th birthday of his son Josesph Baena with some hefty steins of beer.

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Arnie dropped this lovely shot of the pair of them, complete with lederhosen, at the annual beer festival in Munich.

He captioned the picture on his Instagram feed: “Happy birthday, Joseph. Great student, great athlete. I’m proud of you and I love you!”

Awww, Arnie.

Celebrities At Oktoberfest 2016 - Day 11
Celebrities At Oktoberfest 2016 - Day 11

Joseph is, of course, the son he fathered with his housekeeper Mildred Baena, who had worked for Arnie and his now ex-wife Maria Shriver for 20 years.

The discovery of his infidelity and secret love child was the cause of Arnie’s split with his wife, a member of the stately Kennedy family.

He told Howard Stern in an interview last year: “I had personal setbacks, but this was without any doubt the biggest setback and the biggest failure.

“Without any doubt… you really feel like, ‘I am to blame for it. It was me that screwed up.’ And you can’t point the finger at anyone else.”

Joseph recently went viral after he helped out a filmmaker friend by shooting the famous bar scene from ‘Terminator 2’. Check it out below…

Image credits: Instagram/Getty Images