Catherine Zeta-Jones wowed her Instagram followers once again this week as she shared a never-before-seen throwback photo. The 51-year-old actress posted a snapshot showing her and husband Michael Douglas at a film event – and she hasn’t aged one bit!MORE: Catherine Zeta-Jones is a vision in thigh-high bootsIn the picture, Catherine can be seen looking back and smiling at the camera while walking the red carpet with Michael.