Justin Bieber moved to Beverly Hills and his neighbors are already pissed.

Justin Bieber has loaded up his truck and moved to Beverly Hills ... and his neighbors are already pissed.

We've learned Bieber is renting 2 units in a new, fancy Bev Hills condo building.  It's a little strange ... he's rented both a penthouse unit and the unit on the floor below, even though the units don't connect.

We're told Justin needed the space not just for him but for his entourage.  He moved in earlier this month.

Now here's the predictable problem with the Biebs living in a condo building.  The neighbors have already contacted the HOA because of excessive noise and marijuana.  And we're told ... cops have been called twice.

A resident in the building tells The news team, "The smell of marijuana was permeating the floor, especially my hallway which is shared by [Justin's] unit."

Neighbors complained last week of a rager that went on until 4 AM.  

And there's this.  A neighbor told the news team Justin was having a small party Monday where his deck was outfitted with bongs and a bar ... and the entire penthouse floor was being hotboxed.