'Love and Hip Hop' Star K. Michelle -- Bodyguard KOs Fan ... It's Her Greatest Hit

"Love and Hip Hop" star K. Michelle had a close encounter with a touchy-feely fan ... that is until her bodyguard knocked the guy out cold.

Sources close to K. tell us the fan -- who they say appeared to be drunk -- approached the reality star at her hotel early Sunday morning, but when the guy got rude and too close, she warned him to back off.

We're told the fan wouldn't leave and continued trying to touch K. Michelle ... so her bodyguard punched the guy in the face and it was lights out.

Cops were called, but before they arrived the fan came to and then bounced, so authorities will take no action.