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Britney Spears was snapped leaving her dance rehearsal in Los Angeles in Friday, and this is the third day in a row the pop princess has sweated it out in preparation for her Las Vegas residency. This also seems like the third day in a row she's worn these lovely grey sweatpants, but we're going to go ahead and guess that she has a few pairs...

Earlier this week Good Morning America announced that Brit will be performing live on the show on September 17, and she'll give everyone the scoop on her Sin City gig. Not only that, but Caesars Entertainment has reportedly invited employees to "come play a part in the biggest announcement in Las Vegas Entertainment History" on the same date. Wonder if Brit will be making it out there for the bash straight from New York?!