POPSUGAR Fitness Guess Who Pictures of Celebs Working Out at the Muscle Milk Fitness Retreat Guess Who by Fitness 6/16/10 1 Shares Like us on Facebook Sign up for our daily newsletter > Follow us on Pinterest Guess which celeb showed off her guns while working out with trainer Jarett Del Bene . . . Image Source: WireImage Read More Muscle Milk Fitness RetreatJarett Del BeneBody BoxBoxingCelebrity Celebrity Alessandra Ambrosio Shows Off Her Victoria's Secret Angel Figure at a Beach Photo Shoot Cindy Crawford and More Celebrities Embrace the Makeup-Free Selfie Alessandra Ambrosio's Beautiful and Very Naked Maxim Magazine Cover Is a Work of Art Kylie Jenner Is Basically a Mix of All Your Favorite Latina Celebrities POPSUGAR, the #1 independent media and technology company for women. Where more than 75 million women go for original, inspirational content that feeds their passions and interests. Get Results With Our Fitness Newsletter Personalize Weight Loss Working Out Yoga Running Sign up with facebook or By signing up, I agree to the Terms and to receive emails from POPSUGAR.