by Radar Staff
Maria Shriver wasn't the only one deceived by Arnold Schwarzenegger.
Schwarzenegger's out-of-wedlock son -- now 13 -- never knew that the Terminator star was in fact his real father, according to a new report.
Arnold's former long-time housekeeper and mistress Mildred "Patty" Baena never told the boy the truth, even though the actor turned politician showered him with gifts and even put a down payment on his family's home, a source close to Baena's family told the New York Post.
The paper also reports the boy's neighbors in Bakersfield, California said he would even refer to Baena's current boyfriend as his dad.
"He had no idea" about the truth, the source told the Post.
In a further humiliation for Shriver, the boy was born in October 1997, five days after Arnold's youngest son with Shriver, Christopher, was born.
As RadarOnline.com previously reported, Shriver, 55, split with Schwarzenegger,63, earlier this month after 25-years of marriage upon learning of the affair and love child. Shriver has since retained famed Los Angeles divorce attorney Laura Wasser, who's represented such celebrity clients as Britney Spears, Angelina Jolie, Ryan Reynolds, Christina Aguilera and Stevie Wonder.
A joint investigation between RadarOnline.com and Star Magazine was first to reveal the identity of Arnold's mistress.