American Idol [1] went out with a serious bang on Thursday night, with the series finale practically bursting with the show's current and former talent [2]. In addition to Carrie Underwood's jaw-dropping performance of "Something in the Water," [3] fellow American Idol queen Kelly Clarkson [4] proved why she deserved the original prize in 2002 by belting out an epic medley of her greatest hits. From "Since U Been Gone" to "Breakaway," the expectant mom's [5] performance was out of this world. Watch Clarkson do her thing above, and check out the emotional song she performed on the show in February [6] that left the audience in tears.