Britney's Sweating After Hours

Sam Lutfi, Britney Spears Fame Pictures

While you were sleeping, Brit was getting her groove on last night.

But not at some club. No, the pop tart dropped in on a Sunset Boulevard 24-Hour Fitness facility, over by the oh so trendy ArcLight Theater.

She arrived around 1:30 a.m. accompanied by her assistant Carla (not pictured) and Sam Lutfi (who actually looks like he could use a workout).

Then the gym's staff closed off a corner of the gym with a black tarp for the pop star to practice dance moves until around 4 a.m., says a witness.

Either this girl has superhuman energy levels or she's consuming some serious quantities of No-Doz. Either way, her schedule's frickin' exhausting.

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