6:15 PM PT -- Sources close to Kim tell us she had no idea who Danielle was, and was only introduced as "a fan" and not the "Cash Me Outside" girl. They say Kim took pics with several fans.

Kim Kardashian -- who hangs with the richest, most powerful people in the country -- peaced out with "Cash Me Outside" girl Danielle Bregoli.

Kim and Danielle Bregoli's worlds collided at The Polo Lounge in the Beverly Hills Hotel Thursday, where the 2 stars were both enjoying a meal. Danielle was dining 2 tables away from Kim when someone who knew both introduced them.

Sources close to Bregoli tell us Kim was denying photos with other patrons, but made an exception for her. We're told Danielle was apprehensive -- you know, because she talked crazy smack about her whole family in February -- but Kim couldn't have been nicer.