Joining the many stars taking the stage in Las Vegas, Kelly Clarkson performed during day one of the iHeartRadio Music Festival. The "American Idol" alum confidently belted out an array of her hit songs at the MGM Grand Garden Arena venue including her brand new single "Mr Know It All".
Miss Clarkson joined a full slate of talent partaking in the first running of the iHeartRadio Music Festival - as Carrie Underwood, Jay-Z, Coldplay and the Black Eyed Peas were among other acts on-hand for the music extravaganza's opening night. The two day Sin City showcase will close out on Saturday with top names such as Lady Gaga, Nicki Minaj, Kenny Chesney and Jennifer Lopez.