Kelly Clarkson: Orange You Glad I'm Back?

Kelly Clarkson rocks out during a live performance at the Orange County Fair on Thurdsay (July 23) in Costa Mesa, Calif.

The 27-year-old American Idol Season 1 winner wore a David Bowie t-shirt and sung her heart out during some fist-pumping, power pop ballads for the enthusiastic crowd at the Pacific Amphitheatre. Kelly has come back with a vengeance after being out of the spotlight for about two years.

As reported earlier, Kelly will be joining Miley Cyrus, Adele and Leona Lewis for the upcoming VH1 Divas Live event in September.

FYI: Kelly is a repeat outfit offender!

15+ pictures inside of Kelly Clarkson rocking out at the Orange County Fair…