Kim Kardashian Rollin' On Kanye West's Dubs -- A $500,000 McLaren

Kanye West MUST be getting serious with Kim Kardashian -- he's letting her drive his $500,000 whip in L.A. while he's in NYC.We got this pic of Kim driving Kanye's Mercedes SLR McLaren this AM to Barry's Boot Camp in Sherman Oaks. Kim's family just…

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