The 21-year-old make-up mogul was named No. 21 on Forbes' America's Richest Self-Made Women list released on Tuesday. She was officially named the youngest self-made billionaire in March. Kylie was beat out by Oprah Winfrey who was No. 10 with $2.6billion to her name. Not far behind Kylie was Rihanna, 31, who was No. 37 with $600million. Beyonce, 37, failed to make the top 50 but found herself tied at No. 51 with Barbra Streisand with an estimated fortune of $400million. Kylie's half sister Kim Kardashian West, 38, came in at No. 57 with $370million. The list was finished off at No. 80 with Serena Williams, 37, as the tennis great has a net worth of $225million becoming the first athlete to ever make the list.