Sometimes you spend a long time at the lame table before you get to sit with cool kids. But then there are the young Ariana Grandes and Carly Rae Jepsens of the world, the ones who just walk up to the popular table, say "I'm here" and take a seat. England's 22-year-old Charli XCX pulled that move in 2014, co-writing and singing the hook to Iggy Azalea's summer-dominating "Fancy" and scoring her own searing single with "Boom Clap" at the same time. Her latest single "Break the Rules" is burning up the Billboard Hot 100, too.
Previously, Charli co-wrote and sang on Icona Pop's 2012 smash "I Love It," and she released her debut full-length True Romance to little fanfare in 2013. While her sophomore album will arrive on December 15, she's already gotten the ultimate seal of pop approval: landing on Lorde's The Hunger Games: Mockingjay – Part 1 soundtrack alongside established cool kids like Kanye West and, yes, Ms. Grande. —Zach Dionne