Late last week, Yeezy was confirmed to replace Frank Ocean as the headliner of the festival, which takes place over the weekend at Los Angeles' Sports Arena and Exposition Park. At some point during his performance, he handed the mic to Rihanna, who was sitting in the front row and later hopped on stage.
"L.A., make some noise for my n---- Kanye!" she shouted.
The two performed "FourFiveSeconds," the first single from Rihanna's upcoming new album, which features West and Paul McCartney, and the hip-hop star's track "All of the Lights," which features her and Kid Cudi.
Watch a video posted by a fan below (warning: contains explicit language):
West is co-producing Rihanna's new album, which will be her eighth major studio record.