It's not hard to understand why Kim Kardashian 's dating Lewis Hamilton -- the Ferrari superstar popped his top for a shirtless selfie ... and it's got hearts racing. Sir Lewis shared the photo on his Instagram page Tuesday night ... showing him only rocking a pair of Lululemon shorts as he stood in front of a mirror. Hamilton's tatted bod was on full display ... and he looks ready to hop behind the wheel when the Formula One season kicks off in a matter of days. "Race week!" Hamilton said. "I'

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