Francois-Henri Pinault has spoken publicly for the first time about the son he fathered with supermodel Linda Evangelista.
The French businessman - married to actress Salma Hayek - is currently involved in a child support dispute with Linda, who is seeking $46,000 a month.
He has refuted her lawyer's claims that he has been paying "zero" towards raising four-year-old Augustin.
Speaking to the French edition of Elle magazine, Francois-Henri said his son is an important member of his family.
He said he has "recognised" Augustin since 2007 and that "at every possible opportunity he has participated in my family life, whether in France or the United States."
"He is totally integrated within my family," he said, adding that Valentina, his three-year-old daughter with wife Salma, treats him like a brother.
Augustin was born in October 2006 – more than eight months after Francois-Henri separated from Linda, and around the time he started dating Salma.
They were married in 2009.
It was only in July of this year that Francois-Henri was revealed to be Augustin's father.
In numerous interviews, Linda had described the man who fathered her son as a "New York architect".
But this summer the truth emerged when she filed court papers seeking support from the French billionaire.