In Hollywood, one issue is constant-stars rise and fall-and we don't just mean in popularity. Shocking celebrity weight gains are often followed by super speedy slim-downs. Some stars pack on pounds for roles, some inexplicably go on a 'see food' diet. Other times, carrying a 'little bundle of joy' leaves superstar-moms carrying a bundle of baby weight. But like genetic freaks-of-nature, these starlets magically trim their tummies overnight-just in time to rock the red carpet in all their sexy glory.

During this two-hour countdown, we'll rate the most eye-popping body blow-ups and bounce-backs of recent memory and our world renowned group of experts, trainers, media watchers and stars will give their insights and opinions.

Plus, with each Star story our trainers will also come armed with take-away advice for regular Janes and Joes looking to kick start their own 'bounceback.' We'll be dishing on the Star's diet plans, workout regimes and favorite exercise spots ' The very same tips and tricks the celebrities use to slim down. We'll even suggest cheap alternatives to those uber'expensive foods, fitness equipment and fancy clubs.