63-year-old Netscape cofounder Jim Clark began dating 27-year-old Australian swimsuit model Kristy Hinze almost three years ago, she told Australian Women's Weekly . They kept the relationship quiet until now, a few months before she begins hosting the Australian version of Project Runway. Along with Netscape, Clark founded Silicon Graphics and Healtheon. Clark's latest venture, a condo project in Miami, was an unqualified bust. But it hasn't damaged Clark's net worth, reported to be around $1.1 billion.