The 50-year-old actress met Pinault 11 years ago and she was blown away by their exchange, which she said was not a "typical conversation" to spark romance, reported Hello magazine.
"It was so silly. We started talking about football - we're crazy about soccer - then science because we love space and physics.
"He was so smart, charming and funny. At first I stereotyped him as not my kind of guy at all, and then I realised he was my perfect match," Hayek said.