Having captured the hearts and the votes of millions when she competed on the first season of "American Idol" (Fox, 2002- ), singer-songwriter Kelly Clarkson and her powerhouse voice easily walked away with the coveted title. As the first ever "American Idol" victor, Clarkson set the bar high for future competitors to belt out mainstream hits, pop standards and epic ballads on the top-rated reality series, and few outside of Carrie Underwood were able to follow her success. Clarkson parlayed her historic win to become a commercially successful recording artist, from her double-platinum debut album, <i>Thankful</i> (2003), to the Grammy Award-winning single "Since U Been Gone" (2004). Clarkson caught some well-deserved flak for starring in the ill-fated musical comedy film "From Justin to Kelly" (2003), but separated herself from "Idol" with her hit album <i>Breakaway</i> (2004) while widening her horizons with the darker, more rock-oriented <i>My December</i> (2007) and delving into country music in 2008. With <i>All I Ever Wanted</i> (2009), Clarkson returned to a mainstream pop sound and later joined the second season of "The Voice" (NBC, 2011- ) as a guest mentor. Though her own singing competition, "Duets" (ABC, 2012), failed to last, Clarkson remained a powerful voice whose versatility and range fueled songs of heartbreak and self-empowerment that earned her multiple Grammy Awards and sold millions of albums.