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Britney Spears

I May Not Sing in Vegas But

I Can Sure Dance!

12/27/2013 7:25 AM PST BY TMZ STAFF

122713_britney_spears_vegas_launch
Britney Spears got the lead out for tonight's big Las Vegas debut.

Brit's friends and family were there for her final dress rehearsal for the "Piece of Me" show ... and she did not disappoint.

Britney is back to her old self onstage ... her dance routines blew everyone away.  Her singing ....

Check out the clip and judge for yourself.

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