In her new memoir "Uptown Girl," Christie Brinkley reflects on her marriage to Billy Joel and the reasons for their divorce. Brinkley, who inspired Joel's hit song "Uptown Girl," married the singer in 1985 and had a daughter together before divorcing in 1994 due to Joel's drinking problem. Despite rumors of infidelity, Brinkley believes Joel never cheated on her but struggled with alcoholism, leading to their split. Brinkley candidly shares the challenges she faced in trying to save their marriage, ultimately deciding to end it for self-preservation. Both Brinkley and Joel have moved on to new relationships since their divorce.