Christie Brinkley, 67, looks half her age as she puts her incredible 25in waistline on display

Christie Brinkley, 67, enjoys Sag Harbor with daughter Alexa and son Jack

Christie Brinkley and daughters Sailor Brinkley-Cook and Alexa Ray Joel pose for fashion campaign

Christie Brinkley's Daughters Sailor and Alexa Ray Reveal What Would Surprise Fans About Their Mom (Exclusive)