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Nicole Richie was spotted leaving Tracy Anderson's gym in Studio City today, and the former reality TV starlet was spotted slurping on a green juice smoothie that looked like it contained at least 50% swamp water. Nicole is obviously into eating healthy, but we're having a hard time believing her drink is as delicious as it is nutritious!

Of course Nicole wasn't the only hottie there -- we also spotted uber model Gisele Bundchen working on her fitness as well:

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