Country music found its Thelma and Louise. With raw girl-power attitude and serious vocals to match, Carrie Underwood and Miranda Lambert’s live duet of “Somethin’ Bad” stole the show at the Billboard Music Awards, held in Las Vegas on May 18. The duo rocked the new tune in rebel-inspired style, too. Lambert wore the Allstar booties from her own shoe collection, while Underwood worked the stage in red-hot Saint Laurent boots. The country queens hinted at more troublemaking to come: An encore, of sorts, will take place June 4 at the CMT Music Awards in Nashville, Tenn.