Christie Brinkley Reveals Who the 'Other Woman' Was in Billy Joel Marriage

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Christie Brinkley hasn’t been married to Billy Joel since 1994, but she’s still his “Uptown Girl.” 

That’s also the title of her new memoir, out April 29, which dives into her relationship with her now ex-husband. They were married from 1985 until 1994 and share a daughter, Alexa Ray, 39, but there was a very specific issue that got in the way of their marriage.