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It's not like they're making out, but Khloe Kardashian can't be happy about this!

French Montana partied at Miami hot spot Bamboo on May 19, and Life & Style has a photo of him getting quite cozy with a brunette at the club.

A clubgoer tells the mag that around 3:15 a.m. the woman "approached Frenchs table and they locked eyes ... he then whispered something to a friend [and] she was escorted to Frenchs VIP table. The two got pretty close and had a long conversation.

But that's not all! The spy continued, He had his hand in her hair! They were whispering in each others ears and laughing. After that the mystery woman slipped out of the club from backstage and the rapper "soon followed."

Hmm ... what do you make of this?