Elon Musk faces a custody battle with partner Ashley St. Clair over their 5-month-old son, R.S.C., in a New York City court on May 29.

Ashley St. Clair, the woman who claims she gave birth to Elon Musk alleged 13th child, was involved in a custody battle over another child months before she sued the billionaire, In Touch can exclusively report.

Elon Musk is being ordered to appear in court, as Ashley St. Clair argues that she should be awarded full custody of their son, Musk's 13th child. A New York judge will hear arguments about whether or not Musk should take a paternity test,

Elon Musk is growing his family, yet again. On Friday, February 28, Neuralink executive Shivon Zilis — who already shares three kids with the SpaceX founder — announced they had welcomed their fourth child together.

St. Clair, 26, brought the legal action against the billionaire tech tycoon a week after her bombshell public claims that she gave birth to Musk’s 13th child.

More than one week after announcing that she had welcomed Elon Musk's 13th baby, Ashley St. Clair filed paternity and custody petitions against the SpaceX CEO.

While the billionaire has not responded to reports he has a new baby, St. Clair has urged him to "publicly acknowledge his parental role."

He has never asked for photos of our child or checked in after doctor’s appointments,” the author alleged in court documents.

Elon Musk hired a top-notch New York lawyer to take on his alleged ex Ashley St. Clair as she demands the billionaire take a DNA test to confirm he’s the father to her child, In Touch can exclusively report.

Conservative YouTuber Isabella Moody told DailyMail.com that Elon Musk's 'baby mama' Ashley St. Clair was a troublemaker in the office and leaked details about her secret pregnancy.