Katy Perry at opening night of "Britney Spears: Piece Of Me."
Photo: Getty Images/Dolls Kill
This past Friday night (December 27), Britney Spears kicked off her "Piece Of Me" Las Vegas residency at Planet Hollywood to a star-studded opening night audience. In attendance at the big unveiling were Selena Gomez, Adam Lambert, Sia—the list goes on and on and on (as it should because, HELLO, it's Britney, b****). Two stars who didn't just bring themselves but also their style A-game were Katy Perry and Miley Cyrus. BONUS: Not only did these ladies look great, you can actually cop some of what they wore for yo'self!