Schwarzenegger had an affair with his housekeeper, Mildred Baena, in 1996. According to The Sun, the affair happened while Shriver and the rest of Schwarzenegger's family were away on holiday while he stayed home due to work obligations. Schwarzenegger and Baena's son, Joseph, was born on 2 Oct., 1997 — just days after the actor's other son Christopher arrived on 27 Sept., 1997. In his Netflix documentary, Schwarzenegger said he didn't know he was Joseph's father until years later when he began noticing a resemblance between the two. "I just started feeling the older he got, the more it became clear to me, and then it was really just a matter of how do you keep this quiet? How do you keep this a secret?" he recalled thinking.
The actor has since welcomed Joseph with open arms and even invited him to the Los Angeles premiere of his Neflix series "Fubar" in May 2023.
Image Source: Getty / Mario Tama