Bernard Arnault discussed his friendship with Elon Musk, saying the two have even talked about collaborating.Chesnot/Getty Images; Marc Piasecki/Getty ImagesElon Musk and Bernard Arnault have formed an unexpected friendship, the LVMH chief said.Arnault praised Musk's success and called him a "genius" during a CNBC interview.He even suggested the two have talked about a Louis Vuitton-branded SpaceX rocket.An unexpected friendship has apparently blossomed between two of the world's richest men: Elon Musk and Bernard Arnault.Arnault, who is the chairman of luxury conglomerate LVMH and the world's third-richest person, discussed his relationship with Musk, the wealthiest man on Earth, during a wide-ranging interview on CNBC's "Squawk Box" ahead of the Opening Ceremonies of the Paris Olympics, of which LVMH is a sponsor.The two billionaires — Musk is worth $244 billion and Arnault $185 billion, Bloomberg estimates — were to sit together at a lunch for the games, Arnault said, along with the president of France, Emmanuel Macron."I admire very much what he's doing," Arnault said of Musk.