Audrina's Obsessed Fan Arrested at Her Home

The guy Audrina Patridge got a permanent restraining order against last year was arrested this morning after he allegedly showed up to her Los Angeles home.

Law enforcement sources tell TMZ someone inside Audrina's house called 911 after Zachary Loring allegedly started pounding on her front door and ringing the doorbell. We're told Audrina was home at the time of the incident.

Loring was in possession of a large knife when he was arrested, according to law enforcement sources.

We're told cops showed up to Audrina's place and arrested Loring -- who was booked for felony stalking and misdemeanor vandalism. Loring is in custody and being held on $160,000 bail.

Back in September, Audrina claimed Loring kept showing up to her house and giving her creepy poems and drawings -- including one of a woman being hanged.