Rosie Huntington-Whiteley, best known for her work as a Victoria's Secret model, has been named the "Hottest Woman on Earth" on Maxim's annual Hot 100 list. So how does this British bombshell stay so darn fit and trim? We got the scoop!

Huntington-Whiteley, who will replace Megan Fox in this summer's Transformers: Dark of the Moon, credits three things for her figure: a good diet, lots of water and cardio. While not a gym rat before landing the roll in Transformers, in preparation for the movie, Huntington-Whiteley boxed and did lots of cardio and strength training with a personal trainer multiple times a week. In addition, she's big on drinking her H20 and makes sure to have a clean diet! Solid advice for any girl on Maxim's list or not!

Jennipher Walters is the CEO and co-founder of the healthy living websites and A certified personal trainer, lifestyle and weight management coach and group exercise instructor, she also holds an MA in health journalism and regularly writes about all things fitness and wellness for various online publications.