Brinkley writes in her memoir that it initially 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 forever immortalized in the hit song's iconic music video, in which Brinkley appears in.

In a new memoir, the supermodel goes into pretty excruciating detail about the rocker’s wildly excessive drinking, frightening behavior and angry denials when confronted about cheating.

"He was acting delusional in a way I’d never seen before," Brinkley wrote of the incident. "I was so scared that I couldn’t think."Christie Brinkley is opening up the impact that Billy Joel's drinking problem had on their marriage.