left, Instagram; right, Tony Nungary/BFA

Who knew they were such good friends?!

French Montana celebrated his birthday at 1OAK in Hollywood last night, and Justin Bieber was just one of his many famous friends that came out for the soiree. JB posed in a series of Instagram photos with the Moroccan-born rapper, and it appears a good time was had by all! Other attendees included Snoop Dogg, P. Diddy, and Chris Brown. One person noticeably absent? French's ex-girlfriend Khloe Kardashian!

Even after they broke up, French and Khloe had nothing but nice things to say about each other and appeared to stay in contact, but we bet that has changed now that she's dating James Harden and looking after Lamar Odom.

The "Don't Panic" crooner might not have the Kardashian clan to make him famous anymore, but he's still got The Biebs!