Pop diva Britney Spears performs many of her greatest hits during her two-year residency "Britney: Piece of Me" at Planet Hollywood on the Las Vegas Strip.The theater features a dance floor that is surrounded by the walk-out area of the stage and VIP table seating and bottle service for those seated closest to the stage.With constant costume and set changes, Spears performs such hits as "Oops!... I Did It Again," "…Baby One More Time," "Britney," "I’m a Slave 4 U," "Womanizer," "Hold It Against Me" and "Toxic."Spears first appears inside a spherical cage, performing "Work B*tch" from her recently released album, "Britney Jean." With 14 dancers, Spears struts from song to song, at one point performing "Everytime" suspended over the stage as a giant angel. During her performance of "Toxic," she swings off a 20-foot tree into a jungle-themed performance.In her performance of "Freakshow," she brings an audience member up to make them crawl across the stage while she cracks a whip -- it's often a celebrity, such as Mario Lopez and Lance Bass -- who's in the audience. On opening night, Spears closed the show with "(You Drive Me) Crazy" and "Till The World Ends," mixing in "Work B*tch" with the finale, which included a confetti drop.A total of 24 songs are performed in part or full during the 90-minute show.