Rising star Lola Young made her U.S. late-night TV debut Last year, the new singer everyone had their eyes on was Chappell Roan—especially after her late-night debut on Jimmy Kimmel. Now, another Gen Z singer is coming into the pop mainstream: 24-year-old Lola Young from South London guested on Late Night with Jimmy Fallon this week and sang her viral song “Messy.” The song has been everywhere the last few weeks, being used on more than 1M TikToks, including the memed video of Sophia Richie-Grange dancing posted by influencer Jake Shane. Just one of the TikToks from the shows account featuring Young has over 27M...