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Britney Spears' opening night at the Planet Hollywood in Las Vegas may be turning to a star-studded event.  According to "E! News," stars like Katy Perry, Adam Lambert, Sia Furler, DJ Pauly D are among the famous faces who will be lining up to witness the first night of "BritneySpears: Piece Of Me," the singer's two-year residency show.  Miley Cyrus may also turn up in Sin City to see the singer with whom she recorded a track for her  latest album "Bangerz." 

"Piece Of Me" kicks off on December 27th, and manager Larry Rudolph has called it "the best-selling show in the history of Vegas."  A documentary going behind-the-scenes of Britney's grueling rehearsals is set to air on the E! channel on Sunday.  The much-anticipated residency show arrives on the heels of the star's latest studio album "Britney Jean," which debuted at a disappointing number four on the charts earlier this month.