Earlier this year iconic model Christie Brinkley debuted her new memoir, Uptown Girl, where she discussed her own life while detailing failed marriages with Peter Cook and musician Billy Joel - among other things.

Brinkley writes in her memoir that it started out as a song for a "mystery girl" Joel had been having phone conversations with, but when his relationship with Brinkley began, he finished it in her honor. Their relationship was then immortalized in the hit song's iconic music video, in which Brinkley appears in.

Christie Brinkley, the ex-wife of Billy Joel, spoke out about the singer’s recent brain disorder diagnosis with a heartfelt post on Instagram post.