Work, work, work! The world's youngest billionaires

Rihanna was recently named the world's youngest self-made female billionaire at the age of 34. The 'Umbrella' hitmaker is not only one of the best-selling pop stars of all time, she has managed to attain herestimated fortune of $1billion through her Fenty Beauty comestics line.
Take a look to see which other famous faces have been named some of the youngest self-made billionaires through talent, luck and a lot of work, work, work.