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 Guess which celeb showed off her guns while working out with trainer Jarett Del Bene . . . Source: WireImage Read More Muscle Milk Fitness RetreatJarett Del BeneBody BoxBoxingCelebrity Celebrity Kourtney, Tori, and Ivanka Shared Some Cute Kiddo Snaps This Week! Gwyneth, Neil, and Rachel Shared Adorable Snaps of Their Kiddos This Week! You Have to See How Stunning Diane Kruger's Skin Is Without Makeup Will Smith and Jimmy Fallon Perform a Beatbox Throwback to "It Takes Two" Get fit with our daily newsletter Weight Loss Working Out Running Yoga Sign up with By signing up, I agree to the Terms and to receive emails from POPSUGAR.