Justin Bieber Crashes Drake Bell's Album Release Party

Justin Bieber finally responded to Drake Bell's incessant Twitter insults by crashing his album release party Thursday night and basically saying ... YOUR FANS LIKE ME BETTER.

Bell and Bieber have a long-standing beef of sorts ... really it's just Bell constantly insulting Bieber on Twitter, but the Biebs never responds ... until last night.

Bieber pulled up to Mixology at the Grove in Los Angeles last night where Bell's event was going down. He simply rolled down his window ... which caused the crowd to go BONKERS.

But Bieber didn't stop there -- he posted a video of the screaming fans to his Instagram account, but didn't even bother to mention Bell, saying, "So nice seeing my fans at the grove tonight."

THEN he posted a photo on Instagram (see below) of Bell looking down at Bieber's van mobbed by fans with the caption: "Why is @justinbieber sprinter van getting more attention than my album release party." Bieber eventually took it down.

Our sources say the evening ended when things got heated between a guy in Bieber's entourage, Milk Tyson, and Bell's dad.

As the old saying goes ... Biebs who laughs last, laughs best.

@justinbieber dude ! Thank you for coming to my party I didn't know you were down stairs sorry they didn't let you in!! Should have hmu!!