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From 1985 to 1994 Billy Joel and Christie Brinkley were one of the world’s biggest power couples.

She was the world’s most famous supermodel, and he was the singer-songwriter responsible for a slew of beloved hits.

But the marriage ended on a sour note, and now, Christie is opening up for the first time about what went wrong.

American model Christie Brinkley, wearing a silver jacket, and her husband, American singer-songwriter and musician Billy Joel, wearing a checked shirt beneath a black jacket, attend a party to celebrate the release of ‘Biograph,’ held at the Whitney Museum of American Art, in New York City, New York, 13th November 1985. (Photo by Vinnie Zuffanate/Michael Ochs Archives/Getty Images) Christie Brinkley says she and Billy Joel parted ways because of his drinking

In excerpts from her new memoir published by People magazine, the fashion icon says that the split...