5. Cary Grant and Katharine Hepburn (The Philadelphia Story '40, Bringing Up Baby '38) - There was something so glamorous about Hepburn and Grant. They made black and white film fun and colorful in rom-coms of yesteryear. These two were the biggest stars of their time, and when they hit the screen in some serious chick flicks, no one criticized them of not being "serious actors." That in and of itself made them a an unforgettable onscreen couple.