Grimes showed off a proud papa, baby daddy Elon Musk and the couple's newborn baby 'X' on Mother's day, in her Instagram Story. The new mom gave birth just a week ago and much ado has been made about the tyke's unusual moniker X Æ A-12.

According to Elon's mom, they're calling the little boy 'X.' The happy grandma posted this recent pic to her Instagram ...