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.