Britney Spears proudly puts bikini bod on display

She's working out, working it.

Britney Spears, 31, who is prepping for her Las Vegas shows at Planet Hollywood, is offering fans a teaser of her upcoming single, Work Bitch.

The teaser comes in the form a photo of herself in a blue bikini.

"Gonna get my tan on in the desert in between shots on the #WorkBitch set today," she wrote on Twitter, sharing the shot with fans. "It's HOT out here people!!!! #desert #heatwave #WorkBitchDay2."

The track is the first single from Spears' next album — her first since 2011, notes Gossip Cop, and is expected to be released Sept. 17 (Brit Brit's website is counting down to that date). It's the same day the pop star is slated to appear on Good Morning America.