Charli XCX's biggest hits include 'I Love It' with Icona Pop, which was her first UK number-one song, 'Fancy' with Iggy Azalea, a global best-selling single that topped the Billboard Hot 100, and 'Boom Clap,' her first solo top-ten single in the US and UK. Her remix of 'Guess' featuring Billie Eilish also recently debuted at number one on the UK Singles Chart.