Britney Spears debuted her Piece of Me concert to a star-studded crowd in Las Vegas on Friday, shimmying and shaking on stage as the likes of Miley Cyrus, Katy Perry, and Selena Gomez partied to her greatest hits in the audience. The performance kicked off Britney's highly anticipated concert residency at Planet Hollywood's Axis theater, where is she slated to perform 98 shows over the next two years.
With drink in hand, Miley flashed a smile, threw her arm up, and danced along as Britney performed 21 fan favorites, including " . . . Baby One More Time," "I'm a Slave 4 U," and "Gimme More." At one point, Miley joined Britney's mom, Lynne, and sister, Jamie Lynn, with whom Britney hit the studio to record a duet for her new album, Britney Jean. Meanwhile, Katy and Selena sat in the VIP section, taking in Britney's delivery on her promise of fire, water, flying, and updated choreography in the show. Selena snapped pics of Brit's spectacle, which featured several costumes, including a modern re-creation of her sheer diamond ensemble in the "Toxic" music video.
Katy and Miley buddied up after the show at the unveiling of Beacher's Madhouse at the MGM Grand Hotel and Casino, where Miley danced on a ledge as Katy sat nearby. It wasn't just a girls night, though — Kellan Lutz's arrival and one-on-one time with Miley provided further fodder for the rumor mill as speculation about a romance between the two stars amped up. Keep scrolling to see the best pics from Britney's big night and all the party action!