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Yesterday we spotted Nicole Richie leaving the gym in Studio City, and we have to give the starlet props for being so serious about staying in shape! We figured she was just on a fitness kick before her December wedding to longtime love Joel Madden, but it looks like this hot mama is on a mission to keep her body rockin' all year long.

Let's just not take it too far, eh? Click after the jump to see Nicole back when pin thin was in...