Kris Jenner hires 24-hour security after unknown 20-year-old man walks into their house

Los Angeles - Kris Jenner has hired armed security to watch over her home 24 hours a day.

The Kardashian matriarch - who was catapulted to the spotlight following the success of reality show Keeping Up With The Kardashians alongside her famous family - is paying several thousand dollars a month to step up the security surrounding her and her family.

According to TMZ.com, guards are parked outside the family home in two vehicles and watch over her Hidden Hills estate and watch them around the clock.

This comes after a 20-year-old man, who "smelt bad", managed to sneak into her home and claimed he was her 18-year-old daughter Kendall Jenner's boyfriend and Justin Bieber's stepbrother.

He was taken into custody after the mum-of-six called security, who later alerted the police.

Additionally, Kris - who split from husband Bruce Jenner last October after 22 years of marriage - was recently plagued by texts and calls from a man who claimed to have a sex tape featuring her and an unnamed man.

She was forced to call in police over alleged blackmail and told officers she had been receiving up to 300 phone calls, voice mails and texts a day from the person, who was threatening to expose the compromising footage.