Rihanna performed on SNL over the weekend but she upset producers of the show before she went on. Rihanna was a no-show for the dress rehearsal because she claimed she was “sick”. The dress rehearsal is done live in front of a studio audience right before the actual show so when she called out her choreagrapher danced in her place. When she showed up people said she looked just fine. Her rep says she needed to save her voice for the live show. They even had had a doctor in her dressing room and had him administer a shot of penicillin before she went on. Watch the second video…um, maybe that’s why she needed some penicillin….