Poor Britney Spears has just started her much-ballyhooed Las Vegas residency, but already she's had a bit of a wardrobe malfunction.

Brit Brit was performing 'Circus' on her second night in Planet Hollywood when the zipper on the back of her dress opened up, exposing her entire back.

It was an embarrassing moment that was captured on video by one intrepid fan.

However, being the fierce "It's Britney b---h" that we know her to be, the songstress quickly recovered. Did you expect anything less?  We didn't think so.

In fact, despite the mishap, she continued with the routine until one of her backup dancers noticed the problem and was able to start zipping her up. Or at least trying to, without exposing her to the entire audience.

Good work Team Brit Brit. We're bet she's relieve it was the back and not the front of her outfit that malfunctioned. It could have been a lot worse.

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