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The Spice Girls are officially back in business!

Posh, Ginger, Scary, Sporty and Baby banded together yesterday as they rehearsed for their big performance at Sunday's 2012 Olympic Closing Ceremony -- the first time they're all performed together since their reunion tour in 2007-2008.

Though only their rehearsal clothes, the girls still kept to their girl group personas.

Geri Halliwell looked sexy in short shorts, Victoria Beckham kept it classy in all black, Emma Bunton wore a cute flowery dress, Melanie Chisholm was relaxed in a t-shirt and leggings and Melanie Brown was fiesty in a tight tank top and tall black boots!

We don't want to give too much about their performance away -- but it involves the ladies riding around on top of LED covered taxi cabs while they sing.

Who else can't wait for their performance?! Check out more rehearsal pics above!

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