Kris Humphries -- No Bones About Kim's Sex Tape Past

Kim Kardashian's husband is well aware of his wife's XXX past ... but sources close to Kris Humphries tell us, "He could care less about the sex tape."

In fact, we're told Kris truly had "no idea" who Ray J was when Kim's sex tape partner sat next to the NBA star on a recent flight from L.A. to New Orleans.

But after a few hours on the plane, Ray J finally approached Kris and said, "Come on, You know who I am ... I just want to say congratulations." Kris reportedly replied, "Oh yeah, yeah I know who you are."

Sources close to Humphries tell us, "Kris really didn't know who he was" ... but once Ray J reminded him, it didn't matter to him because Kris is simply not bothered by Kim and Ray J's previous relationship.