Kris Jenner Hires Round-the-Clock Security After Stalker Makes Stink

Kris Jenner's taking no chances after Kim Kardashian came face-to-face with a stinky stalker outside the Jenner home last month -- Kris has now hired 24/7 security.

Kardashian sources tell TMZ, guards are parked outside the family home in 2 vehicles which monitor her Hidden Hills estate 24 hours a day -- and the guards are ARMED.

We're told she's paying several thousand bucks a month for the hired muscle.

Kris has had her share of scares over the last year -- threatening phone calls, paparazzi intruders, SWAT pranks -- but the stinker was the last straw.

TMZ broke the story, the 20-year-old man was taken into custody after allegedly sneaking onto Kris' property. Kim called security, who then alerted police. We're told the kid claimed he was Kendall Jenner's boyfriend and Justin Bieber's stepbrother. Oh yeah, and he smelled like death.