Justin Bieber sexy 'hook-ups' revealed: Selena Gomez's troublemaker ex parties, invites girls back to Calabasas home for 'hot and hazy' fun

Apparently, Justin Bieber's all about having a good time.

UPDATE: Chantel Jeffries PHOTOS, Justin Bieber's mug shot go viral: singer parties with stunning model (DeSean Jackson's ex) before DUI, 'drag racing' arrest in Miami

Not sure if these sexy rendezvouses happened before or after the Biebs' epic egging incident, but the 19-year-old pop crooner is one helluva ladies man!

Bieber and his friends were recently spotted partying at a club near his Calabasas home. The singer allegedly invited a group of girls back to his place to continue the fun... and apparently things got pretty "hot and hazy."

A "mystery" girl (er, groupie) reveals to Us Weekly, "A little after midnight, my girlfriends and I were invited out by Justin and his crew, so we got into his pimped-out Mercedes bus."

The Biebs started playing some unreleased music, and asked the girls for their opinions.

The snitch continues, "At one point he started flirting with a few of us - he was asking us to move in closer to him while cracking stupid jokes. After we'd been driving for a while, we asked the guys where we were going. The answer, 'Calabasas, ladies!'"

Once there, Bieber and his crew led the ladies down a dark hallway to a private room, where he started playing more tunes.

"It was hazy and hot. Eventually we got so bored that we called a cab for ourselves," the source explains. "There were still a lot of other girls hanging out."

The girls apologized to the cabby for making him drive so far. His response - "It's no problem. I've been picking up girls here for the past four nights!"

Ouch! Doesn't look like the Biebs is ready to settle down again anytime soon!

Wonder if Selena Gomez is jealous, or has she finally moved on too?