The Australian model, 29, has told Harpers Bazaar Australia that her baby boy's name is Racer.
Worthington is yet to offer the meaning behind her unique choice of name.
In 2015 the New York based star hit back at those criticising her eldest son's name.
"My sons [sic] middle name IS a respectful nod to my late father, whose nickname was affectionately, Zot," she wrote.