If you purchase an independently reviewed product or service through a link on our website, Rolling Stone may receive an affiliate commission. Korean beauty brand TIRTIR announced BTS star V as their first-ever global brand ambassador earlier this month, and the singer was on hand to celebrate Friday night at TIRTIR’s new “Radiant Pop-Up” in Los Angeles. V was joined by Madelaine Petsch, Charles Melton, Isabela Merced, and Emily Alyn Lind, among the many stars celebrating TIRTIR at a special