Justin Bieber and Kim Kardsahian may have had an inappropriate Twitter-lationship a couple years ago but the two have kept their feelings for each other on the DL since Kim's been busy getting married, divorced and dating Kanye ...

But now it appears the two have something else in common -- chrome on wheels!

Justin got the amazing $100K Fisker Karma for his 18th birthday and Kim posted this Twitpic, showing off Scott Disick's new Audi R8 that comes with a $65K price tag.

Question is, which do YOU like better?