Supermodel Christie Brinkley is trading in the runway for Broadway as she gets ready to make her stage debut as merry murderess Roxie Hart in Chicago on April 4. People magazine joined the beautiful blond as she slipped into Roxie's signature black ensemble for her own Chicago photo shoot, and needless to say she looks killer! "I'm loving every second," the 57-year-old mother of three told the magazine. "Every time I've ever been to a Broadway show, I've said, 'I wish I were up there.'" Take a look at Andrew Eccles' glamorous shot of Brinkley, then make plans to catch her in action this spring at the Ambassador Theatre.