The Kindergarten Cop's kid is going back to school.

Yes, that was Arnold Schwarzenegger's ex- housekeeper/ baby's mother Mildred Baena, and their son Joseph, shopping at an Office Depot in Southern California in this photo just released to RadarOnline.com.

Mildred -- who worked for Schwarzenegger and Maria Shriver at their mansion in the posh Brentwood neighborhood of Los Angeles for 20 years -- wore a pink and white striped shirt for the Saturday shopping trip. Joseph, 13, sported a shaggy 'do reminiscent of his dad’s Pumping Iron days. He wore a plaid short sleeve shirt and shorts, carrying a blue backpack.

Better late than never.

Arnold Schwarzenegger has been spending time with his out-of-wedlock son recently in an effort to rebuild their relationship, RadarOnline.com has exclusively learned.

After it was made public that Arnold had fathered a 13-year-old with his former housekeeper, Mildred Baena, she and their son Joseph went into hiding, but Arnold has had secret visits with the boy and his mother.

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Arnold Schwarzenegger’s baby mama Mildred Baena is finally coming forward with her side of the story, more than a month after it was revealed that he fathered a child out-of-wedlock with the former housekeeper.

According to Baena, their son, now 13-years-old, found out just one year ago from his grandmother that the former governor was his father to which he responded, “Cool!”

In what Baena claims will be her first and only interview, she opens up to HELLO! Magazine about the intimate times she shared with Schwarzenegger saying it was only “a few times.”