Kelly Clarkson Performs New Single ‘Mr. Know It All’ at iHeartRadio Concert [PHOTOS]

September 23, 2011 8:41 pm

The original “American Idol” winner Kelly Clarkson looked gorgeous in sequins and sounded even better belting songs like “Mr. Know It All” from her upcoming album Stronger at the iHeartRadio Music Festival in Las Vegas!

She dedicated her sassy new single to all the girls and guys who’ve dated a know it all. Somehow we think everyone in the crowd could relate!

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Kelly gave us a blast from the past with former hits like “Since You Been Gone”, “Walk Away” and “Because of You.” She sounded better than ever and we know spited girls everywhere will be picking up her album full of girl power anthems!

She closed out her set with “My Life Would Suck Without You” and had everyone in the crowd jumping up and down right along with her. Our lives would suck without Kelly.

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