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Kim Kardashian tried to lay low Wednesday as she climbed out of her Rolls-Royce and headed to the gym for a workout.

Kim and sister Kourtney are excited to get healthy again now that they're back in Los Angeles -- both complained that they didn't work out enough or eat healthily enough while in New York filming the next season of Kourtney & Kim Take New York.

Kim rushed into the gym, avoiding questions from our photogs. With all the rumors running 'round that Kim and new hubby Kris Humphries are already on the rocks, we can understand why!