Rihanna was spotted at Mariah Carey's show in Las Vegas, continuing her tradition of fangirling over the singer. This marks the second year in a row that Rihanna has attended Mariah's holiday concert, showing her dedication to the iconic artist. During the show, Rihanna stood up on a chair to get a better view, prompting an audience member to yell at her to sit down. This incident has sparked a debate about concert etiquette, with some appreciating fans who stand up during performances. Despite the criticism, Rihanna's enthusiasm for Mariah Carey remains unwavering, making her annual appearance at the show a viral sensation.