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

Christie Brinkley gave her fans a candid glimpse into her personal life in her 2025 book, Uptown Girl. While her most famous former relationship was with ex-husband Billy Joel, the mother of three spotlights her marriage to Peter Cook and his affair in the memoir.

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.