One source claims the 18-year-old was actually bullied for being there -- apparently not everyone thought she earned the right to walk the shows!
The insider spilled:
Chris Brown continued to double time RiRi this weekend by bringing Karrueche to the Agenda Trade Show in Long Beach where he was promoting his clothing line Black Pyramid.
We're guessing KT was just there for moral support since she was conveniently lurking in the background while Chris posed with fans.
With this latest news, we can only imagine the dramz that went down Sunday night inside My Studio, where both RiRi and Karrueche were partying.
Ch-ch-check out all the evidence (below).
[Image via Tumblr/Instagram.]