Forbes.com have announced their annual list of 30 Under 30, featuring individuals with "amazing" achievements under the age of 30.
24-year-old Adele Adkins was chosen because her second album 21 has sold over 23 million copies worldwide, while Justin, 18, was picked because of his dedication to his career with the release of his third record and Believe world tour.
UK stars didn't fare too badly with Mumford And Sons' frontman Marcus Mumford, One Direction and Calvin Harris also on the top 30.
The American magazine also picked up-and-coming musicians such as Dr Dre's newest protege Kendrick Lamar, Mac Miller and sextet Delta Rae.
Forbes executive editor Michael Noer said: "The 30 under 30 represent the best creative, intellectual and entrepreneurial energy of an entire generation. These are people that you will be hearing about for a very long time."