Britney's back -- and she's working, bitch.


The 31-year-old has been gearing up for her Las Vegas show at Planet Hollywood, and now she's giving fans a sneak peek on the set of her upcoming track "Work Bitch."


On Sunday, Spears posted a photo of herself in a tiny blue bikini, and sky-high sparkling heels, to her Instagram account, which she captioned:


"Gonna get my tan on in the desert in between shots on the #WorkBitch set today. It's HOT out here people!!!! #desert #heatwave #WorkBitchDay2"



The previous day, the pop star posted another photo, which she simply captioned "#WorkBitch," and tweeted:


"Hot day on set... ;) A little dirty, little flirty, danced my ASS off. Stoked for tomorrow!"




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