Somebody showed off some serious BUTT CRACK while leaving a private party the other night…  It actually looks a little bruised!!  GROOOOOSSSSSS!!!

Can you NAME THAT CRACK?!?!

LENNY KRAVITZ!!!

He was leaving a private party after his show in Prague and his bum just kind of fell out as he was getting into the SUV… He clearly doesn’t wear underwear…

Photos: Splash News Online