Rihanna Joins Kanye West From the Audience for FYF Fest Performance

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Rihanna and Kanye West perform on stage at the 57th Annual Grammy Awards in Los Angeles on Feb. 8, 2015. 

Kanye West enlisted the help of a very popular fan for his set at FYF in Los Angeles Saturday night -- Rihanna

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Performing Rihanna's hit "FourFiveSeconds," which he co-wrote and co-produced with Paul McCartney, West seemed to find Rihanna in the audience during his set and crew passed her a mic to accompany on the song's chorus. While he led the packed crowd in a pop song sing along crouched from the side stage, with a smile on his face, Rihanna excitedly sang the hook below from the pit. 

"Make some noise for Rihanna in the crowd," West shouted afterwards. 

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Later, as West wrapped his show attempting to play one-hit-per-minute for the last 10 minutes of his set, Rihanna joined him again. This marked probably the biggest crowd reaction of the night, as she actually joined him onstage this time for the My Beautiful Dark Twisted Fantasy single "All of the Lights." 

West was announced as Saturday night's headliner just the day before with news that Frank Ocean had canceled "on his own terms."

West was also joined by Travi$ Scott during his set. 

See some fan shot videos here: