Leona Lewis burst onto the scene when she won the UK "X Factor" in 2006. She covered and released "American Idol" winner Kelly Clarkson's "A Moment Like This" and then signed a five album deal a year later. In 2007 she released her debut album Spirit and the hit "Bleeding Love" ruled 2008. The song has sold over 10.4 million copies worldwide making it one of the best selling singles of the decade. AXS takes a look at 10 of her best songs.