Britney Spears' Las Vegas residency begins tonight (Dec. 27). Entitled "Piece Of Me," the best-of show has the industry buzzing about whether or not the program will be a success and if it is, what it will mean for future pop acts in Sin City.

Not only has Spears been counting down the days until "Piece Of Me" opens on her Instagram, the "Perfume" singer has been hard at work in rehearsals for the project. Last night (Dec. 26), Spears held a dress rehearsal for the two-year show, revealing various outfits and even video of one of her numbers has been unveiled online.

As seen on OhNoTheyDidnt, it seems as though the "Piece Of Me" show will be leotard-friendly, with Spears wearing no less than three one-piece outfits.

Spears also rocks some fedoras, belly shirts and sparkling nude outfits, recalling some of her glory outfit days from the mid-2000s.

Check out a small gallery of Spears' outfits over at ONTD.

More than simple photos of the "Piece of Me" show have surfaced online. A video of a performance hybrid of "Gimme More" and "Break The Ice" has also popped up online. And bad news for Britney fans: it seems like all those lip syncing rumors are true.

Though Spears' camp denied that she would be performing to a backing track, the music accompanying the video performance sounds absolutely identical to the CD versions of "Gimme More" and "Break the Ice" from Spears' 2007 album Blackout.

It's no real surprise that Spears is heavily relying on backing vocals. The choreography for her "Piece of Me" show appears to be extremely in-depth, and Spears isn't exactly known for her live vocal abilities.

Regardless, the show is bound to be a spectacle. "Piece of Me" opens tonight (Dec. 27) at Planet Hollywood in Las Vegas.

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