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  The singer was giving her all on stage during her Las Vegas performance Saturday, but she suffered a huge wardrobe malfunction leaving her back exposed. What a circus! Britney Spears' dress nearly fell off her body in what may be the best wardrobe malfunction of the year.   While performing "Circus" at her Las Vegas show Saturday, Spears danced in a tight sequin dress, but apparently didn't have the time to zip it up in the back. As she twirled and cautiously dipped, Spears' dancers frantically tried to fix the malfunction before it became a total catastrophe.

  In footage taken by a fan (see it here), Britney can be seen giving it all she's got in a high energy performance in a sparkly outfit. But as she turns around, the back of her dress comes underdone.   However, despite nearly showing a lot to flesh, Britney stayed calm and took her wardrobe malfunction in her stride as she continued to dance as her backing dancers set to work, putting her dress back together again.

  Wardrobe malfunctions happen to the best of us, even Britney Spears. The pop star's "Piece of Me" concert almost got a little too risque when her costume flew open during Saturday night's show. Spears was performing "Circus" when her costume's zipper opened up, exposing her back.