Christie Brinkley attends the 125th Metropolitan Opera opening night at Lincoln Center on September 22, 2008 in New York City. (Photo by Andrew H. Walker/Getty Images North America) Christie Brinkley's philandering ex-husband Peter Cook went on 20/20 with Barbara Walters to explain his behavior. Why he felt compelled to rehash old news in front of a national TV audience is unclear, but the architect, who cheated on Brinkley with a teenager and spent $3,000 a month on porn, says he was...
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