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Nicole Richie and Kim Kardashian are total gym rats!

Both hit the gym in Studio City in all black -- black tanks, black leggings, black shoes, black sunglasses, black bags -- what are you two so down about??

Still, Kim seems fairly positive about her workout regime. She Tweeted:

    "Rise & grind!!!! Early morning workout time! ... Its that Armenian work ethic! ARMO BEASTMODE BABY!"


With her wedding only five days away, this is crunch time for Ms. Kardashian, and apparently she's counting on her inner Armenian! For Nicole, constant work-outs are a habit. Vote in our poll below -- who's your pick, Kim or Nicole?