Rihanna celebrated her birthday by performing a medley of her hits—"Umbrella," "Only Girl In The World," "Rude Boy," and "What's My Name"—during the halftime of last night's NBA All-Star Game, and she proved herself to be a pretty good sport, trying gamely to hit the notes on the songs of hers that are, uh, vocally demanding. But Kanye West, who rose from below the stage to a brass fanfare and threw down a few verses from his new single "All of the Lights," was the real spotlight-stealer. (He arrives at around the 9:05 mark of the below clip.)