Rihanna performed at the NBA All-Star Game halftime show yesterday, and not only did she look smokin' hot, but she was also celebrating her 23rd birthday!

The R&B starlet was joined by Kanye West and Drake, and oddly enough, it wasn't Kanye's singing (or his bright red jeggings) that drew the critical comments. A handful of observers noted that Rihanna didn't bring her A-game to the stage, and after watching this video, we're not sure what to think -- she certainly didn't have a problem gyrating her hips! But the whole performance seemed a bit slow, didn't it?