5. Leona Lewis
When the 3rd season of the British version of The X Factor came to an end in 2006 and this gorgeous lady was announced the winner, nobody thought it would lead to a number one hit in 30 countries. Since her time as a casting show contestant, Leona sold 7 million copies of her debut album Spirit, and 2.5 million copies of her second album, Echo. Her song My Hands was also chosen as the main theme song for the English version of Final Fantasy XIII, which sold over 7 million copies worldwide. Leona has also won three Grammy Awards, solidifying her spot as a renowned artist.
