Billboard is ranking the 25 greatest pop stars of the 21st century, highlighting One Direction and Bad Bunny among others. One Direction, formed on The X Factor, redefined pop music and fandom in the 2010s, achieving global stardom with five albums and a dedicated fanbase known as 'Directioners'. Meanwhile, Bad Bunny, recognized as the 23rd greatest pop star, has transformed the music landscape as a leading figure in Latin trap and reggaeton, having secured numerous accolades including three Grammy Awards. His unique approach and refusal to conform to trends have solidified his position as a cultural icon, making him a significant force in the music industry today. Both acts exemplified the evolution of pop in their respective eras, showcasing the genre's capacity for global influence and diversity.