We simply cannot keep track of the revolving door of ladies who are willing to hook up with Justin Bieber at the drop of a hat! And apparently, neither can the security guards at Bieber's favorite Los Angeles haunts!

On Monday night the Biebs brought number one bae Hailey Baldwin to The Nice Guy in Hollywood, and the 21-year-old pop superstar was joined by Cody Simpson and Madison Beer at the venue for an impromptu gig. Bieber has been performing at a number of small spots in Los Angeles over the last few weeks, so we're happy to see him back on stage.

But back to Hailey! After parading new fling Jayde Pierce around last week while Hailey was out of town, it seems like he's heating things back up with his favorite Baldwin. But he failed to let security know, because when the leggy model tried to hop in the car with her beau, club security mistook Hailey for a fan and shouted, "What are you doing?!" before finally letting her in the car. Oops!

Misunderstandings aside, it looks like the crew had a blast though:

A video posted by Madison Beer (@madisonbeer) on