People who went to FYF Fest Saturday night got a bonus when Kanye performed ... Rihanna.
She hopped on stage twice, once to perform "All of the Lights" with Kanye, and a second time to perform "FourFiveSeconds with him."
This could have been a tough crowd ... Frank Ocean, who was scheduled to headline, dropped out and Kanye took his place. But by the end it was, "Frank who?"
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