When Britney Spears hits the tour circuit in Sacramento, Calif., come Thursday, she’ll be dancing “Till the World Ends” in her signature sexy style. Extra got a sneak peek of the singer’s sultry “Femme Fatale” tour costumes, courtesy of designer Zaldy Goco, and the looks are smoldering. “The real inspiration of course is Britney herself,” Goco tells Spears pal Dylan Rudolph.