After Frank Ocean pulled out of Los Angeles' FYF Fest, Kanye West stepped up to fill the headlining slot for yet another festival. Although he was a last-minute substitute, the 38-year-old rapper had a few surprises in store for the audience, including surprise performances by Rihanna and Travis Scott during his Saturday set.

Rihanna joined forces with West on stage to deliver "FourFiveSeconds," the duo's hit single with Paul McCartney, and "All of the Lights." Scott came out for a quick set of his singles "Antidote" and "Upper Echelon." The "B-tch Better Have My Money" singer's addition to the show was a last minute decision, Billboard notes. West spotted Rihanna while attending FYF Fest and decided spur of the moment to hand her the mic for "FourFiveSeconds," quickly launching into "All of the Lights" before parting ways. "Make some noise for Rihanna in the crowd," West told the audience at FYF fest. The rapper is co-producing Rihanna's upcoming, eighth major studio album.

West kicked off his performance with Watch the Throne's "No Church in the Wild," most likely a nod to Frank Ocean and his absence. Ocean, who sings on the track's chorus, was supposed to headline FYF Fest but had to cancel just days before concerning "scheduling conflict."

West's pregnant counterpart, Kim Kardashian, attended the Saturday gig to support her husband, bringing her sisters Kourtney Kardashian and Kendall Jenner along for the show.

Upon hearing West's opening song of "No Church in the Wild," fans and audience members alike thought Ocean would guest star but concertgoers quickly realized they were harboring false hope, Entertainment Weekly notes. The "Bound 2" singer's set spanned classics from his career, leaving out all material from his upcoming LP, Swish, aside from "All Day" which was previously released.

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