The model and author opened up about her strained relationship with her brother Greg Christie Brinkley is opening up about her estranged brother, Greg Brinkley. During a conversation about her new memoir Uptown Girl at the 92nd Street Y in New York City,

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.