Shocking details have emerged about the cause of Christie Brinkley’s split from fourth husband Peter Cook. It seems the Cover Girl found out her 47-year-old husband had been having an affair with 19-year-old Diana Bianchi. Cook had been plying the girl with gifts of cash and a car, as well as the promise of helping her with her singing career, and talked openly of wanting to leave his marriage to Brinkley. Cook would e-mail Bianchi with details of where she could find piles of cash stashed randomly around Long Island, NY – which were sometimes reportedly hidden under rocks. “She was a victim of this guy who preyed on her naivete, her immaturity, the fact that she’s 19,” says the teen’s lawyer. “There’s just so many things wrong with what this guy did.” Cook reportedly met Bianchi at the toy store where she worked, while he was shopping for Brinkley’s children. When she was laid off, Cook offered Bianchi a position at his architectural firm, where their relationship progressed. Brinkley found out about her husband’s disturbing behavior from Bianchi’s stepfather, and then had Cook’s email account investigated to uncover emails between he and the teen. Brinkley also reportedly met with the police after discovering what had been going on.