In between his troubles and travails with the law, Justin Bieber has enough time to take cheap shots at his ex, Selena Gomez. Isn't he just terrific? 

TMZ talked to the embattled pop star, and the topic of discussion was Selena's recent admission into rehab. Bieber and his band of merry derelicts are all "laughing" at the fact that Selena is currently in rehab... simply because it flies in the face of her earlier claims that The Biebs was "a bad influence" on her. In addition, Biebs and his band of merry derelicts admit that while he does smoke and drink, Selena is actually the worse of the duo -- she could outdrink Bieber and his friends, smoked marijuana like a chimney, and has even been doing drugs!

Bieber admitted that he's happy to not be with Selena anymore because she's "high maintenance" and completely out of control.

Meanwhile, according to U.K.'s Metro, Justin Bieber's relationship with Miley Cyrus goes beyond the basic "brotherly-sisterly" type relationship -- rumors have now surfaced that the duo were actually having an affair throughout the whole time he was with Selena! And Selena came clean about this during group therapy in her rehab session. "She told the group how much she was struggling with Justin's infidelity and his obsession with hooking up with other women. She learned from mutual friends time and again that Justin was cheating, and that knowledge was breaking her heart. She kept talking about a girl named Miley -- a friend of hers who betrayed her by hooking up with her boyfriend behind her back. Dealing with the stories about Justin's random hookups were bad enough, but hearing that he was involved with one of her closest friends was the ultimate betrayal for her," writes Metro (via The Star).

It sounds like this isn't really going to end well for anyone involved! What do you think -- do you think that this is all some publicity, or that Miley really slept with Bieber, or that this is all made-up tabloid gossip?!