How many albums has Leona Lewis sold?

Leona Lewis has sold over 35 million albums worldwide. Her debut album, "Spirit," was released in 2007 and sold over 10 million copies worldwide, making it the best-selling debut album by a British female solo artist. Her second album, "Echo," was released in 2009 and sold over 5 million copies worldwide. Her third album, "Glassheart," was released in 2012 and sold over 2 million copies worldwide. Leona's fourth studio album, "I Am," was released in 2015 and sold over 1 million copies worldwide.