Kelly Clarkson is an American pop rock singer-songwriter, best-known for winning the first season of the popular reality television show, American Idol, in 2002. She is currently the most successful American Idol contestant of all-time, ahead of 2005 winner, Carrie Underwood. She is best-known for her hit singles "A Moment Like This", "Since U Been Gone", "My Life Would Suck Without You" and "Because of You". To-date, she has sold over 23 million albums worldwide.