Peter Cook, 61, and his student fiancée Alba Jancou, 20, had a cozy lunch at Serafina Always Thursday.

“She was cheerful in a pink sweater and they chatted happily throughout the lunch,” a spy told Page Six. “They sat in a prime circular booth and people watched. It seemed like a romantic lunch date. They sat close and were like two peas in a pod. They were very chatty.”

Christie Brinkley’s ex met Jancou when she was a recent high school grad.