There's trouble in paradise.. I mean in 'homeboi paradise!'

Popstar Justin Bieber has finally had it with Lil Twist and Lil Za after his expensive jewelry went missing at his Calabasas mansion.

According to TMZ, "sources connected to the Biebs said that he was furious earlier this month when he discovered the jewelry and other items were nowhere to be found."

The site adds:

"Twist and Za had both been staying at the house and they had thrown several parties in Justin's absence. We're told Justin had no idea who stole the items, but blamed Twist and Za because it was on their watch. 

He later ordered them out and sources say both of them are PISSED. We're told Justin has finally seen the light that he's gotta change ... or else. Justin just performed in Singapore (above) and actually showed up 15 minutes early, but not before he gave 30 tickets to kids from a local orphanage. 

Our sources say Justin is privately saying he knows he's been on a bad path, and it seems at least for now he's moving in the right direction."

Plus, Miley Cyrus recently revealed in Rolling Stone magazine that she has transitioned from being a child star while Justin hasn't -- and feels like she will be his mentor in making that transition.