A Justin Bieber fan was arrested at the singer's Beverly Hills home yesterday after cops say she wandered onto the property looking for the singer for the third time this week.

Cops got a call to the home around 7:30Pm and she was detained by his security guards until officers arrived.

The woman in her 40's showed up at the home two other times in the last week and was warned by security to stay away.  Justin was home during the incident, but did not make contact with the woman. She has been booked for trespassing.