Oops! . . . Britney Spears did it again. After making an epic return to the MTV Video Music Awards stage in August, the singer sizzled once again with an incredible performance at the iHeartRadio Music Festival in Las Vegas on Saturday. Flaunting her fit figure in a halter-neck top and feather skirt, Britney worked the crowd with a collection of some of her greatest hits. Not only did she sing her new single, "Make Me . . . ," alongside rapper G-Eazy, but she also took us way back with classics like "Toxic," "Stronger," and "(You Drive Me) Crazy." Let's just say, we are a slave to this video.