Looks like Rihanna overlooked Drake calling her his “side chick,” because she was pictured having fun at his “Would You Like A Tour?” concert at the Staples Center. Rihanna was pictured smiling backstage with pals Wiz Khalifa and Snoop Dogg, and looked super-sexy in a white crop-top and jean shorts. Drake also took photos with other famous attendees, including Khloe…