On Saturday night, Kanye West headlined FYF Fest, replacing Frank Ocean after he pulled out. Rihanna was watching the show in the front row, so West handed her the mic and she went onstage to perform 'All The Lights' and 'FourFiveSeconds'. But she wasn't Kanye's only special guest: he also brought out Travi$ Scott to perform 'Antidote' and 'Upper Echelon'. You can watch some clips from the set below.