If anyone knows the tips and tricks for looking young, it's Hollywood's finest. And lucky for us, tons of our favorite celebrities, like Jennifer Aniston and Jennifer Lopez, have shared their secrets. From their go-to snacks, fitness workouts, and other healthy habits that they swear by, they've given us some insight into how exactly they keep their bodies healthy, and what they do to get that dewy, youthful, and fresh skin. So we went ahead and rounded up some of the best tips beloved stars have shared over the years. These…