The Dangerous Liaisons star decided to recruit Julia's boys Raul and Benjamin to model his Technobohemian collection at the Museum of Art in San Juan in memory of their beloved father as he presented his clothing line in Latin America for the first time.
He told reporters, "It was moving for everyone when he died. Raul was a great talent and inspiration who has left a beautiful testament in his sons."
Malkovich struck up a close bond with The Addams Family star as they performed together in a 1985 stage production of The Arms and the Man in New York.
Julia died in 1994, aged 54, after suffering complications from a stroke.