French billionaire Francois-Henri Pinault, the husband of steamy actress Salma Hayek, insists that he has never neglected the once-secret son he had with catwalker Linda Evangelista.

“[The boy] is totally integrated within my family,’’ Pinault said of little Augustin, his now-4-year-old love child with Evangelista.

“At every possible opportunity, [Augustin] has participated in my family life, whether in France or the United States.”

Pinault spoke out for the first time about the boy to French Elle amid Evangelista’s recent, nasty $46,000-a-month child-support suit in Manhattan Supreme Court.

The fashion model’s lawyer has accused Pinault of not forking over a penny to Evangelista since little Augie was born in 2006, while lavishing Valentina — Pinault’s daughter with Hayek — with luxury.

The furious Frenchman insisted that he has always ”recognized” Augustin as his own — and treated him as such.

In July, The Post was the first to report that Pinault had fathered Augustin.