Messages sent between Elon Musk and a woman claiming to be the mother of the billionaire's 's 13th child are said to have been revealed. Ashley St Clair , 26, announced last week she had secretly given birth to the baby five months ago. She has since filed a court petition demanding full custody of their son and asking Musk, 53, to take a paternity test. Now, private message between Musk and St Clair have been revealed. In one, the mother sent Musk a picture of her with the newborn in hospital.