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Heidi's Running Mates

Kim Kardashian! Miranda Kerr! The Project Runway host is getting fit with a slew of famous friends

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KIM KARDASHIAN

Turns out it actually is hard to keep up with the Kardashians! Klum credits the reality star with keeping her motivated during their June 26 early-morning jog. "We took a walking break and she was the one who pushed us to start running again," blogged Klum. "We did four miles!"