HEY, BIEBER – HERE’S MY $3 MILLION ITEM! When JUSTIN BIEBER tossed that wild-and-crazy bash at his Calabasas estate, he ordered guests and workers to sign confidentiality agreements threatening to sock them for three million$$$ if they breathed a word to anyone, but – HERE’S MY SCOOP: The Dwieb got trashed – literally – when two guys at his party picked him up, shoved him into a garbage container and clamped him inside! Reports My Party Spy: “Two hip-hop wannabes Justin had invited arrived with a really cute girl – the girlfriend of one of them. And as guests began drinking and getting high, Justin flirted quite openly with the guy’s girlfriend throughout the night. But at one point, Boyfriend realized Girlfriend was missing… and so was Bieber!” The suspicious guy and his pal began searching the house – and finally found the girl backed up against a kitchen wall, furiously making out with the panting pop star. The guy erupted, screaming: “What the f*** are you doing with my girlfriend?” He lunged for Justin, who backed off and barked sarcastically: “Hey, man, be cool. It’s not like you’re married to her!” (BIG MISTAKE, KID!) Instantly, the guys yanked Justin off his feet, hauled him to a plastic garbage can outside the kitchen door, shoved him inside – then locked down the handles as he and the girl screamed for help! Justin’s bodyguards came running and sprung him loose as his tormentors left the mansion, dragging the girl behind them. “Other than that, it was a great party,” sighed my spy!