I knew from Peter’s face that he was guilty. . . I also felt tears began to well in my eyes," Brinkley writes.

In her new memoir, Uptown Girl, supermodel Christie Brinkley reveals exactly how she uncovered her fourth husband’s affair. Brinkley doesn’t shy away from detailing her messy split with architect Peter Cook in her memoir after discovering he had been having an affair with a high schooler.

Christie Brinkley's new memoir lifts the lid on her ex-husband's affair with a teenaged girl. In her new memoir, Uptown Girl, the supermodel shared details of the moment she learned of Peter Cook's betrayal.