Christie Brinkley sits down with ET's Emily Curl for ET Then & Now, looking back at nearly five decades in the spotlight. The start of the 50-year career? Her iconic Black Velvet whiskey campaign, which Christie just recreated for a new ad! She also revisits her breakout film role in 'National Lampoon's Vacation,' revealing she barely appeared on set for six weeks, because her scene depended on rain. Plus, secrets from filming ex-husband Billy Joel's 'Uptown Girl' music video, including that her heels sank into hot pavement between takes!
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